What is backfocus. (For example, on a C11 HyperStar, the backfocus is 59.

What is backfocus The web site lists the part number as 07545 in the heading, but in the description it says 07549. It’s no longer the shutter button. But if you find yourself unable to activate the shutter without placing the AF point over the point of focus, we’d recommend setting up your AF-C and AF-S priority selection so the shutter overrides focus. 3 FR/FF - posted in Cats & Casses: Can someone confirm what the actual backfocus of this focal reducer/field flattener is? I bought this from B&H. g. It takes some time to get used to, but it solves so many problems that you may encounter when shooting. On scopes like dobsonians the focal distance is too short for most cameras to focus. I don't really know what to do rather than kick the Art 50 out RASA 8 Backfocus - posted in Experienced Deep Sky Imaging: I have a RASA 8 with an ASI2600. Both Hypercam Fan Cooled and TEC cameras have a front female What is backfocus distance for Canon 6D Sensor? - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Okay, so I have a Takahashi TOA-130 with a Reducer and am looking to make a custom adapter to get the proper backfocus distance. With Sony there is an alternative way to do this, without any custom settings or button changes to create a back-button. They dont list a backfocus at all. If you want to shift autofocus points (focus on a point and recompose) then disabling the shutter af is necessary. Im trying to get it to work with a ZWO ASI533MC. I think it wouldn't be hard to get a barlowed imaging train in at close to zero backfocus. It should take only about a quarter-turn of the screw to fine-tune the focus system for your lens. 2) A lens or telescope has Backfocus /r/photography is a place to politely discuss the tools, technique and culture of photography. 1. I dont need flattening or correction with this scope. In other words, you rack the focuser all the in What is "back focus"? - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Trying to decide if I can use the Orion field flattener with my current setup: Orion ED80T CF Triplet APO (f/6 480mm) Pushing the back focus button to find focus. 475 in Back focus refers to focal flange length, which is the distance between the rear lens element and the camera's sensor. What back-button focus does is remove the focus actuation from the shutter button and instead assign this function to a button on the back of the camera (AF-ON). In this article, I will go over the focus and recompose technique, which can be quite useful when photographing in various environments - whether shooting in low-light situations, or composing your shots with the subject in the corner of the frame. I recently decided to give EAA a go. As of February, 2018, the following Pentax K-mount DSLRs support AF Fine Adjustment: KP Back Button Focusing - Easier than you think!. AF-ON button on a Nikon D850. With Back Button Focus, you can pre-focus In this episode of Back-Focus 101, I describe how filters change the back-focus requirement of your optical system, both visually and mathematically. Back focus is the distance between the last optical element and the focal plane. In the following tech tip we will go over commonly asked questions regarding back focus. Back focus and front focus only tends to be a problem with (D)SLR and SLT cameras. Back button focus is a key tool for sharply focused images of moving subjects using autofocus area, autofocus mode and back button focus Technical Note: Back focus refers to the "focal flange length". 25 - posted in Cats & Casses: Hi, I have a Celestron C9. Here are some general suggestions for different types of photography:. Back focus refers either to the industry standard 55mm distance from the front of a DSLR to the film plane or the sensor, or the spacing required for a flattener or reducer. Camera & photography tips from the friendly experts at Clifton Cameras. Celestron 8SE OGA Backfocus - posted in Celestron Computerized Telescopes: I know this question has been asked before, but I cant find a satisfactory answer: I need to know how to achieve proper backfocus for Note: The M42 sensor tilt plate attached to the camera needs to be taken off, and you may need to re-adjust the tilt when re-installing the plate back; The original OAG can not be replaced to OAG-L, but if you have the M68 OAG, you can also use the M68 OAG instead; This method does not support the telescopes with M42 threads at the end side. If the focal flange distance is off, the lens will soften as zoomed in or out even if it is parfocal. Repeat steps 4 through 8 until focus is consistently sharp. In this video I will explain how to activate and use the AF-On button for back button focus on your Nikon Z camera. This is when we usually switch to manual focus, which allows a photographer to take full control over the camera’s focusing system. Get the tools and strategies you need to take action. They have an autofocus sensor that is separate to the main image sensor. I wanted to take a look at back focus to make sure I have things setup correctly for optimal Getting the proper back-focus for your imaging camera is a vital step in getting the best data possible out of your telescope imaging/research rig. Avoid caffeinated beverages after lunchtime. A strong word (haywire) was necessary to describe the problem of focal shift (back focusing and front focusing) but it was necessary. What is the back focus- front focus problem? We can define this problem as focus (or back) instead of where it should focus briefly. This tech tip will focus on the following three: Back focus, or as your textbooks in film school might explain, is also called focal flange length and is basically the distance between a camera’s sensor and the rearmost element of the lens. In the video above and this blog, we will explain why we use back button focus. Distant Blue has created an app that gives you a perfect back focus chart download. Based on my experience, I’ve found Back Button Focus to be useful in several shooting scenarios: Sports and Wildlife Photography: These types of photography often involve fast-moving subjects. Just like in AF-S mode. This sets the auto focus (and the exposure, if [] Evostar 72ED, backfocus - posted in Refractors : Does anyone have the same setup as I do (my signature) and how much backfocus do you have? I have exactly the same adapters that zwo recommends but I still have elongated stars. Note: this button will not focus until you manually assign it to do so. 4 and Sigma Art 50 1. Each type of lens mount has a different back focus distance. Problem 2: Delay in High-Speed Continuous Shooting. The issue of back-focus is commonly seen if a fast aperture lens is used. Occasionally though, when you put two items together that are out by a little margin, you end up with a bigger problem. 05 mm. One of the most common user-error What is back focus and why is it important for your telescope? The simplest definition of back focal length is the measurement between the last optical component of a telescope (such as a corrector or reducer) and the Essentially my understand is that the back focus is the distance from the last optic element to the sensor. uk/o/proav-uk-18826832727 Contact our Sales TeamEmail: Sales@proav. On a calibrated parfocal lens, the focal distance set on the lens should only have to be set once, if the subject does not move. A back focus The sensor to flange spacing (backfocus) for Hypercam Fan Cooled Cameras is 12. I use the Celestron OAG for guiding and get round stars to the image edge with my canon 60D. The camera has 17. Specified aperture is 127mm (clear What is “back focus”? Back focus is a focusing mode, which means that you’ve separated the shutter release button from the autofocus feature. 475 in: C11: 5. photographersfreedom. When I started astrophotography, I had no concept of what backfocus was - and when the word was bandied about on forums, it came with the assumption that peo fantastic photos from back button focus. Back focus is the distance from the last optical element of your telescope or accessory (such as a field flattener or a focal reducer) to the focal plane. It's vital for achieving sharp and clear images, especially when using accessories such as filters, reducers, or correctors. Let’s talk about back button focusing. Page 1 of 2 - How Critical is the C11 Edge HD Backfocus - posted in Cats & Casses: I believe the back focus for the C11 Edge HD is 146. I do not know if the Televue Fixing Front and Back Focus The Remedy. This is because of the way they are set up for autofocus. Correct backfocus distance - ZWO - posted in Beginning Deep Sky Imaging: Im confused On this website, ZWO outlines options for achieving a backfocus length of 55 mm: https://astronomy-imsolutions-55mm/ I understand the need to adjust the length when using a filter. Now, the recompose method. With most DSLR cameras, by default, you half press the shutter button down to set the Back button focus separates the focus and shutter release functions, moving the former to the AF-On button at the rear of the camera. co. When you release the back focus button, your camera will stop trying to acquire focus with the focus being locked to where it was when you released it. Achieving Optimum Back Focus Distance - posted in Beginning Deep Sky Imaging: Im working to better understand back focus and how to achieve the optimum back focus distance of a particular imaging train. ; Switch off or put away all electronic devices an hour before bedtime. Page 1 of 2 - 8" EdgeHD back focus question - posted in Cats & Casses: On my 8 EdgeHD, what is the back focus distance using a Tele Vue standard long SCT Adapter (Visual Back) for 2 Diagonals, and the Televue 2 diagonal? I know that the aberration correction in this scope is designed for best performance at 5. Often referred to by experienced photographers as “back-button AF,” this feature lets the user customize the When showing a userform (running its Show method) it not only shows up on the screen but also takes the focus (the destination of e. Back Button Focus Nikon - What Is It And Why Do You Want To Use It? *Get your free back button focus cheat sheet here:* https://www. Filters For this purpose, we often use "Metal Back Distance" and "Back Focus" interchangeably. 5mm backfocus out of the box . 7mm; using What is back focus? I have read a few threads saying the fuji S2 suffers from it, and also the d70. We give an overview about the topic, explain which equipment is n The best focus mode to use with your camera will depend on the subject of your photography and the specific conditions. When you photograph a player, a referee or other The back focus is also sometimes referred to as focal flange distance. The camera is supposed to have a 55mm backfocus. 25 ota. ; The lens does have such a focus position sensor, but it is in need of calibration. To fix back focus, the screw should be turned clockwise. Someone mentioned recommended back focus, a google search revealed nothing helpful. People will talk about a camera/lens combination consistently focusing behind the desired point as backfocus. Page 1 of 3 - C8 with f/6. This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers. You don’t always want the camera’s autofocus system to activate every time you press the shutter, no matter Upcoming ProAV Academy Events: https://www. Get answers to your questions in our photography forums. 25 When we shoot images with a digital camera (DSLR or a compact point & shoot) leaving the camera to do the focusing (auto-focus on), often the AF mechanism goes haywire. Back focus, in its simplest definition, is the measurement between the last optical component, such as a corrector or reducer, of your telescope and the focal plane. 3 reducer backfocus help with zwo 533 - posted in Cats & Casses: Ive have Celestron SCT 8 with the Celestron f/6. No More Refocusing Every Time You Let Go of the Shutter In your case one of two things is probably happening: The lens in question is an older design that does not include a position sensor to report back to the camera how far the focus elements actually moved when the camera has sent an instruction to move a specified amount. This button is operated with your thumb and will quickly feel natural to you with a little bit of practice. I felt Id gotten my process pretty Backfocus requirements for corrective stuff and backfocus for the focal plane are not the same. Assuming you’re using a tripod and the subject isn’t moving – you’re all set until you move the tripod. There is nothing worse than buying all the adapters and finding because of accumulating errors by the Probably the primary reason to use back button focus is to remove the need for refocusing if you take your finger off the shutter. To fix front focus, the screw should be turned counter-clockwise. The front/Back focus on mirrorless (Canon) is real, I believed I was finally free from the front/back focus till I had 2 lenses to compare (Sigma Art 35 1. Essentially my understand is that the back focus is the distance from the last optic With back button focusing, the half-press of the shutter button to achieve focus disappears. 63 reducer/corrector - posted in Beginning Deep Sky Imaging: Apologies in advance, Im sure this would have been discussed before but Ive searched to no avail Could someone help explain how to calculate the optimal back focus/spacing for the Celestron f/6. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from A good tip when your trying to work out your distance for actual back focus vs theoretical measurement is to buy all the components except for the last length of say T-ring and make that variable so you dial in the actual vs the theoretical. The term "back focus" has existed in the optical industry for many decades. The included documentation for the redcat What is Back Button Focus? Back button focus is a feature in modern-day digital cameras, DSLR/ Mirrorless/ Medium format cameras. I have read post after post here where people say they are still working on getting proper back focus. I have seen some pictures of ZWO cameras on a C8 but they are all of the place Back focus is the distance from the mounting flange of your telescope’s focuser to the camera sensor when the image is in focus. /r/photography is a place to politely discuss the tools, technique and culture of photography. I have tried adding up to 5 mm of tiny spacers but its still not enough fz750 wrote: I'll put this as a beginner's question, as I certainly am where mirrorless is concerned. Checking the back focus of the lens and making sure that it is properly set is important when setting up a new configuration of lens and camera, as this may affect how closely the lens is sitting to the sensor. Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. 4 is having back focus problems all the time whereas the 35 Art one gets 100% accurate. The back focus is specified by the manufacturer, no calculation is on the part of the user. Is the correct backfocus for the ASI585MC Camera using the Celestron C8 scope 55mm. Although manual focusing What is a cameras Back Button Focus mode? How to use a camera Back Button, when to use it and how to set it up. AF-A (Automatic Autofocus) There are other autofocus modes, too. 1) The camera has a Backfocus measurement. 73mm and what I found on Take the guesswork out of habit-building. To achieve this correction, A few years back, Matt Korinek and I switched to using back button focus and it changed the way both of us photograph. Page 1 of 2 - back focus for a Celestron C9. In this video I explain 'back focus' only comes into play if you combine two separate parts of optics, like a lens/mirror with a corrector/flattener/barlow. When a shot “racks,” it moves the focal plane from one object in the frame to another. For example, you might have a camera that back focuses every so slightly (but still within the What is Back Button Focus? Within your camera’s menu settings, you have the ability to assign certain functions to different buttons on your camera. You simply illuminate the subject and use the back button to lock focus on it. Also known as a "focus pull" or "pulling focus," the technique can include small or large changes of focus. The reducer has a . The performance of the combined system will strongly depend on the distances between the optical elements. The recess on the ASI2600 is 17. How do you spot backfocus problems? It’s actually pretty easy to spot backfocus problems because it introduces ‘curvature’ to your system. Over the past couple of years (and really since writing my ebook) I've become a huge advocate for making the switch to back button focus. This distance is important if for example you want to use a reducer at its specified reduction factor. You may realized that all your pictures with a specific lens are slightly out of focus because your camera doesn't focus accurately. 5mm, as measured from the front foremost part of the flange excluding threads. We will now discuss how to use your in-camera autofocus adjustment to correct front- and back-focus. Back-button focus is a technique that puts a button on the back of your camera is in charge of focusing. Im trying to determine backfocus on the Spacecat for my ZWO 2600 camera. There is also many times a debate of what the proper Rack Focus DEFINITION What is rack focus? A rack focus is the filmmaking technique of changing the focus of the lens during a continuous shot. In addition, when you work with action pictures, the back focus button allows you to stop focusing on the main subject without stopping the shooting. When using your telescope stock without any accessories, you can easily reach focus because the What is backfocus? BBC Sky at Night Magazine's Scope Doctor Steve Richards solves your astronomy ailments. Just because a dot in the viewfinder is lit up directly over what you want to focus on doesn't necessarily mean that is the exact spot the camera is focused on. To calculate the backfocus of your setup, add up the backfocus of all the separate components. How would a person go about figuring out what the recommended back focus is. So, if people complain that their camera is backfocusing, it means they're unhappy. However, ZWO gives options for setups involving filter wheels and a filter drawer which Page 1 of 2 - Help a brother out, what is the real backfocus spec of the Antares F6. The user does some arithmetic (back focus- sensor recess on camera = spacers required. The light from these devices can stimulate your brain and prevent you from . 750 back focus. Page 1 of 2 - William Optics Back focus - posted in Beginning Deep Sky Imaging: Since I have had endless nights of no imaging opportunities for weeks on end, as a relative newbie I figured I should spend some time dialing in some things that I can without imaging. I am currently using a 55 mm back focus but I do not believe this is correct. Half-press the shutter release button to return to normal operation, and make sure AF-C is set as your focusing mode. Back focus is important because some accessories require a specific In the world of photography, achieving precise focus is a requirement when capturing great images. Figure 1. In the video above, photographer Pierre Lambert looks at what back button focus is and when it might be beneficial to use it. co It could also be the same with your lens - it could front or back focus ever so slightly, but be within that “tolerance”. 975 in from 3 in Primary Mirror Baffle Tube Lock Ring: C14: 5. Does it make for soft images? How do I spot it? How do I avoid it? thankyou once again. 3 SCT reducer? - posted in Equipment (No astrophotography): I just purchased this reduce my Maksutov Cassegrain because this is strictly a reducer only & does not flatten. 5mm +- backfocus can make a huge difference with a fast optic system such as a RASA. Its Show fires in Workbook_Open() but the form itself is used relatively rarely so we want the focus to go back to the main application window right after its appearance. But, even the most advanced autofocusing system can be fooled in difficult shooting conditions. It’s perfect for football photography. You will need: A camera with a back focus ring. I always assumed that, due to using contrast detect focusing, that there would be no front/back focusing issues on mirrorless cameras, and this would be one definite advantage of using, say, a Nikon Z6 over a D750, for example. The Sigma 50 1. The series of our video tutorials starts with setting the back focus of a broadcast camera. Im wondering about back focus with the Edge HD 9. When you add a reducer, I am pretty sure that the focal plane moves closer to the back of the telescope, so the back focus is reduced. This space is where the magic happens – it’s where the telescope’s image comes to a sharp What is Backfocus? In the simplest of definitions, it is the ability or inability of the focuser to bring the image into sharp focus be it through your eyepiece or your CMOS camera. What is Back-Button Focusing (BBF)? With most cameras, you depress the shutter button half way to focus and then to actually take the picture the button is pressed the entire way. For years, Canon EOS cameras have offered photographers an option to change the way autofocus is activated. James. Instead of using a half-press of the shutter button to activate autofocus, you hold down a dedicated button on the back of your camera instead. I the 'standard' situation you'd have three elements (main optics, corrector, and camera sensor). Back button focus is one of the most useful camera techniques to get the perfect focus and nail your shots. The back focus -front focus problem is also one of the main problems of af lenses. Note: this article is not covering all the aspects leading to sharpness, but don’t forget that to get a crisp image with a fast moving subject you also need a high shutter speed in order to freeze motion, like 1/500s or 1/640s in I've done events, weddings, sports (including motorsport) as well, despite trying BBF never found it useful enough or comfortable to use. If this distance isn’t correct, your astrophotos can end up Understanding back focus - posted in Beginning Deep Sky Imaging: Im upgrading to a ZWO 1600MM and Im trying to understand what Id need to achieve the correct back focus for my setup - but Im struggling to fully understand what it is - or more specifically why its so important. It shows the selected point during focusing on the camera as if it was focused, but if taken careful after shooting, it is Adjust the back focus ring for the sharpest focus. This is the distance between the rear lens element and the CCD. Before we dive into the tests for backfocus, it’s important that you understand the underlying concepts of flange focal distance, backfocus, and depth of focus as well as why backfocus matters. And the app is appropriately called just “Focus Chart. Even a shift of + / – 2 can still create softer and thus unacceptable TOP TIP. My question is - what effect does changing the back focus actually have? My understanding is that the focuser Back focus is a term that causes much confusion among newcomers to astrophotography. Back button focus helps to remove the focusing feature from the camera’s shutter release button. Simply half press the shutter to get the camera to focus on the subject A back focus is when the focus falls slightly behind your subject and a front focus is when the focus falls slightly in front of it. Too easy. What is Backfocus? In the simplest of definitions, it is the ability or inability of the focuser to bring the image into sharp focus be it through your eyepiece or your CMOS camera. Page 1 of 2 - Correct Backfocus for Celestron C8 and ZWO ASI585MC Camera - posted in Major & Minor Planetary Imaging: I have looked around but couldnt find specifically what I was looking for. Normally, to focus on a subject, we pick the focal point we want, then depress the shutter button halfway. Learn how to use back button focus for fantastic photos with me, pro photographer Don Orkoskey of WDO Photography. eventbrite. With back button focus, I want to separate the button that takes the photo from the button that focuses. The backfocus of a camera is the distance from the plane of the sensor to the front of the camera. Want to take amazing wildlife photos? Check out my new course with 20 modules and over 5 hours of content, no fluff! https://journalofwildlifephotography. The standardized 55mm backfocus of correctors doesn't mean sensors can't focus not at 55mm, it means when in focus the image will have distortions due to the Line up your focus point, press your back focus button and, when you're ready to take the shot, press the shutter button. I will also go over why you may want to u As long as you press and hold the back focus button, your camera will adjust the focus, like in AF-C mode. It will be located toward the rear of the lens housing. This is because when people talk about back focus, they often mean different things: the back focus on a telescope, the Back focus is the distance from the end of your eyepiece drawtube to the focal plane of your telescope. Whether you’re shooting a landscape, a candid portrait, or a blink-and-you’ll-miss-it moment Back focus is really very different from back button focusing, so to make sure you don’t get them mixed up again, let’s take a quick look at back focus. (For example, on a C11 HyperStar, the backfocus is 59. When I checked the back focus to my camera chip it was about 118 mm or about 28 mm short of the specified back > 6 minute read How to Use Back-Button Focusing Let’s take a look at why it’s a good idea to use this advanced focusing method, what situations it can help you in, and how to prepare recommended back focus - posted in Beginning Deep Sky Imaging: I made a post yesterday about getting a new zwo asi224mc. its not the Edge HD just the standard tube. This process of flange focal adjustment, AKA back focusing, with a cine zoom lens like the ones used in the video will help videographers or filmmakers What is telescope back focuswhy is it importantand how do you set it correctly?Having the proper back focus between your telescope and camera is critic What Is Back Button Focus? Most people are used to the default behaviour of all cameras: Give the shutter button a half-press to focus on the subject, and then fully depress the button when they are ready to take the shot. Corrective optics are additional pieces of gear that help fix optical aberrations that are present in most telescope designs. Sometimes it is the photographer’s own fault, however: ether they accidentally focused on the background due to imprecise placement of the selected focus point, or there was actual movement in the scene. . 475 in from 3 in-2 in Reducer Plate 5. 5mm. ukTel: +44 (0) 1442 292929This Half-press the shutter release button to return to normal shooting operation, and make sure AF-C is set as your focusing mode. Does the back focus point of a SCT telescope change position at all with the movement of the primary mirror? Or does the back focus length only have meaning when focusing at infinity? Thanks jk Back button focus is just what it sounds like. ” It’s only available on the App Beyond that, many issues that users identify as front-focus or back-focus issues are actually related to a lack of understanding how their camera's complex focus systems work. On the ZWO site they Today’s DSLR photo tip continues with our series of tips covering functions on your camera that you’re most likely not using. Newtonians often suffer from Page 1 of 2 - Calculating back focus for Celestron 0. ) 2. Sometimes the distance is Page 1 of 2 - RedCat 51 & Camera Backfocus - HELP! - posted in Refractors : Hello All, I just purchased a Spacecat 51 with a ZWO EAF motorized focuser attached with the Deep Sky Dad adapter kit. keystrokes). Back focus is the distance from the back of the telescope to the focal plane. Does anyone know what the backfocus distances are for the Canon 6D sensor to the front of the What is Front and Back Focus? This video explains what front and back focus is for video, film and DSLR cameras & how to recognize if you have a problem with Help me understand Backfocus in plain English - posted in Experienced Deep Sky Imaging: These are the two facets to Backfocus as I understand (or misunderstand) them today. I began to experiment with back button focus a few years ago and didn't really understand how powerful it Taken literally, the question in the title is about what happens to the back focus when you install a reducer. But this can also be done The camera should then be put in mirror lock-up mode and the lens removed, exposing the mirror box. Just connect the camera with a nosepiece or a T thread adapter and adjust the focus knob to taste. In other words, you rack the focuser all the in Back focus distance from primary mirror baffle tube lock ring (in) C5: 5 in: C6: 5 in: C8: 5 in: C925: 5. Adapter length is HyperStar backfocus minus camera backfocus. These modes allow for precise focusing on a What are the Pros & Cons of back button autofocus?It's easy to get stuck in a rut with your photography and camera technique and never try new things. Is their a sticky explaining how you get the recommended back Page 1 of 14 - Orion 127 Maksutov - Back focus and aperture - posted in Cats & Casses: I thought it might be sensible to post this study in its own thread, but it is inspired by: Aperture in C6 & C8 for various configurations elsewhere in Cats and Casses The OTA under examination was an Orion Skyview Pro 127mm Maksutov. I had a couple of questions around the procedure. 25 say that at zero backfocus, the focal length is 1925mm. 99 every 6 issues. My problem is that I found a difference between the backfocus value annonced by Celestron: 28. I have been struggling to get some exact info on back focus for this setup. For example, refractors suffer from field curvature, and so need field flatteners to correct for this. 3 focal reducer/corrector on a 6SE OTA? Ive seen the The "back focus" is the distance from the front of the camera to the sensor, how far the sensor is recessed into the camera body. The shutter button releases the shutter. When I press the shutter halfway down, it only meters and takes the Backfocus is the distance from the rear lens element to the image sensor, crucial for achieving sharp focus in astrophotography. Takahashi FSQ106EDX4 Back Focus Question - posted in Refractors : I am using a ZWO ASI2600mm pro with a 36mm filter wheel with my new TAKFSQ106. This measurement is critical because it ensures that the light from the stars converges precisely on your camera’s sensor, resulting in sharp images. And because of their The Celestron EdgeHD design corrects for much of the aberration and field curvature inherent in the standard Schmidt-Cassegrain. BACK FOCUS CHART Download a camera focus chart app. With the usual Nikon and a t-adaptor, that's 55mm. For example, if we take an Atik 460EX camera, this has a Back button focus is a game-changing way to operate your camera. Note: Most lenses are at their sharpest focus at about a What is this back button focus that you may have heard other photographers talking about? In this post we’ll demystify the feature on most cameras that allows you to take more control over your images for sharper EdgeHD 9. NINA is the preferred method to adjust tilt and backfocus at once with precise data and analysis of your sensor. It varies greatly depending on the type of telescope: Schmidt-Cassegrain telescopes (SCTs) typically have generous Back focus refers to the distance from the last element of your telescope to the camera’s sensor. I have the necessary adapters to attach SCT thread to Why use back-button focus? It just makes more sense to some people to have one button do only one thing – not to have one button do two things simultaneously (actually, three, because most shutter buttons also lock the exposure too as a default setting). He also looks at when it may be more beneficial to do things the old-fashioned way with a half-press of the shutter. Say, the userform is a custom made toolbar. I understand there is no requirement like the 55mm needed on most triplets, but is there a number I should start with to easily reach prime focus? Backfocus is the distance between the end of the telescope, or the reducer, and the camera sensor. The distance from the back of the lens to the focal plane is called the backfocus distance. Again, leave your camera on Continuous A/F or AI Servo. One of the most frequent questions I have received in the last month has been about back button focus and how Your reducer specifies a backfocus of 55mm. Magazine gift subscriptions - from just £18. This is why BBF is very often used by sports photographers, or wildlife photographers (in order to capture a flying bird for example). Understanding how things work is one step towards being able to diagnose the problem. This is a Procedurally, if the back focus distance isn't known but the reduction factor is, am I safe to test at two or more different distances, platesolve to establish the achieved focal length at each distance, and calculate the back With af servo, keeping (either of) the back focus pressed overrides the shutter. For instance, automatic autofocus is supposed to be able to intelligently switch between AF-S and AF-C depending on if it thinks your subject is moving, but this can often cause you problems because the camera doesn't actually know what you consider to be the subject - especially if there are Modern cameras are getting more and more sophisticated and complex. When the autofocus button and shutter button are one and the same the camera may not take the photo at the precise moment the shutter button is pressed. Flange Focal Distance, Backfocus, and Depth of Focus. If you do feel you have reached a bit of a plateau, and are having particularly problems with focussing on moving subjects, it may be a good time to try back button With every new generation, a camera’s autofocusing system becomes more sophisticated, more precise and more capable. Backfocus on a C11 EdgeHd - posted in Beginning Deep Sky Imaging: Hi team - I recently made the plunge from my current setup, an Explore Scientific 127mm refractor, to a C11 Edge. Page 1 of 2 - Back focus of SCT - posted in Cats & Casses: Hi, this is a newbie basic question. 4). The back button focuses the camera. Back focus refers to the focal flange length, which is the distance between the rear lens element and the camera's sensor. Simply put, back focus is when the lens of your camera is focusing on something behind NOTE: This is essential for doing night photography, especially things like light painting, where you’re literally shooting in the dark. A refractor has a fixed focal length, the distance from objective to the focal planed, and no back focus requirement. Captured using back button focus & a tripod to ensure sharp focus. 25 back focus questions - posted in Equipment (No astrophotography): Hello everyone, Ive been searching the forums for a very specific back focus issue and cant quite seem to find an answer so I thought Id start a new thread (if someone knows of a previous thread, please link or quote in comments). There are a lot of automatic functionalities that take care of exposure, focus, image stabilization, and other actions. This measurement in millimeters, is the distance the sensor is set back from the face plate of the camera. I am wondering what is the back focus needed. This is the button typically used for back button focusing. Light enters the camera, hits the mirror, and then a portion of it bounces down (or up) to the autofocus sensor, which is then used Welcome to the wonderful world of Back Button Focus (aka BBF on social media) and custom controls and custom settings. You should now notice that half-pressing the shutter release is not causing the camera to focus. my imaging camera is the ZWO asi294 mc pro. The course includes a 20-page PDF what is the Backfocus for Meade Series 4000 f/6. 3 focal reducer. First, navigate to the focus adjustment screen (for Pentax DSLRs, it's found at the end of the Custom Function menu). 11 email lessons walk you through the first 30 days of a habit step-by-step, so you know exactly what to do. When it is, tighten the back focus ring retaining knob to secure the ring. Because it’s so natural for photographers to keep our finger half pressed down on the shutter button to focus, we never really stop to think about what an awkward manoeuvre it is! Camera adapter length varies depending on the HyperStar lens and camera model. The back focus of the lens is easily calibrated on many lenses via a back focus ring, which can be properly adjusted while testing the lens optically at home or on set. Technology does change so I can’t say that I would never stop using this feature, but from now on, I always want my focus to be independent of the shutter release. Unsure how the first photo is a good example because I'd be half pressing the shutter button to keep focus whilst panning and following the car. Landscape Photography: Manual focus or Autofocus Single (AF-S) or One-Shot AF (Canon) modes are often best for landscapes. Depending on the brand, this is done by assigning the focus lock to a button in the back of Expert news, reviews and videos of the latest digital cameras, lenses, accessories, and phones. ZWO always has schematics that show the spacing, The one for your camera is linked below. As someone noted above, it is the optics that determine what the required backfocus is, not the camera (and when a reducer/flattener is used, it is that device’s specification you reference), although the camera will consume a portion of that backfocus in terms of how far back the sensor is from the face of the My backfocus measurements of my C9. On cameras with interchangeable lenses, sometimes changing a lens will also change the focal flange length, and the discrepancy can cause an image that's Back button focus is a term you may have heard bandied about by other photographers, and wondered what the heck it is, and whether you should be using it! Until Canon first launched the EOS-1 back in 1989, they introduce the back focus concept, the act of separating the autofocus from metering adds a great deal of flexibility to the cameras. These measurements are available on all of our astrophotography cameras. com The scope does not have a "back focus" spacing. It is the distance from (generally) the center of the rear lens element, to the plane of focus (the film or sensor) when the lens is focused at infinity. Backfocus is a term used to describe the distance from the rear nodal point of the lens to the plane of focus on the film or imager. (Consistently in front is front focus. Firing the shutter without having to worry about hunting or refocusing is a major benefit of using back-button focus. When you calibrate, you’re telling your camera to shift the focus one way or the other when it does the imaging, so your final photo matches what you see in the viewfinder or screen when you take it. When you let go, the focus stays locked. gutrx kkwhji afgp enazeje otlih ilfoiq rbm wqcug rits nqbjmap