Before the rush

Before the rush
by evan-pak

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Autofocus is the ability of a camera/lens system to automatically adjust the focus of the lens via a motor attached to the focus group of the lens. Contrast with manual focus.

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3answers
89 views

what is the best focusing mode for prime lens [on hold]

what is the best focusing mode for 50mm prime lens. Manual mode or Auto mode to get crisp results ?
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2answers
120 views

Is contrast-based autofocus really better than phase-based, or is it just me?

I feel like I quite consistently get: Blurrier autofocus Lower exposure when shooting with my T5i's viewfinder than its LCD (i.e., in phase-based vs. contrast-based mode). But whenever I search ...
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1answer
70 views

Why is my NIKON AF-S 18-105 VR on my NIKON D5500 not autofocusing?

When I acquired my camera, my 35 mm AF-s lens clearly worked as did my 18-55 lens. I am not sure a recently acquired 18-105 AF-s lens works. How can I check? Simple replies please as I am clueless. I ...
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1answer
53 views

Focus accuracy on new Tokina 11-20. Expected or defect?

I seem to have a focus issue with my new Tokina 11-20. It's mounted on a Canon 1000D(XS) The camera is on a tripod. The lens is wide open F/2.8, at 11 mm. I manually focused on the T on the box ...
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3answers
64 views

How do I get my Canon 70D to detect my Tokina AT-X 400mm lens?

I have recently purchased a used (but remarkable condition) Tokina AT-X 400mm f/5.6 with an EF mount. This works on my 6D, allowing for aperture and focus control from the body. However, my 70D ...
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3answers
428 views

How to focus on fast moving objects with a low-end dslr?

I will go to an Enduro race and I want to take sharp, in focus, photos. I only have a Canon 550D, EF-S 18-55 IS and EF 50mm f/1.8. I tried using autofocus on moving motorcycles and 90% of them were ...
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1answer
85 views

How can I enable back button focus and disable focusing with shutter button on a Nikon D5500?

I assigned the AE-L, AF-L button to activate focusing on my Nikon D5500, but I can still focus using the shutter button. I would like to know if it was possible to use the AE-L/AF-L button to set ...
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1answer
50 views

Why does using the viewfinder on my Nikon D3200 prevent autofocus from locking and the shutter from releasing?

I just bought the camera less than a week ago and I was happy with it until things went wrong. I woke up one morning to take photos and noticed that when I pressed the shutter button, it didn't ...
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2answers
219 views

Is there any reason you would use one-shot focus over AI-Servo?

The only one I can think of is recomposition - achieving focus and then recomposing. Are there any others? The convenience of tracking your subject seems very, very convenient - moreso than the lock ...
3
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1answer
97 views

Nikon D5500 Autofocus with Sigma DG 150-500mm 1:5-6.3 APO HSM

Should the Nikon D5500 be able to auto-focus the Sigma DG 150-500mm 1:5-6.3 APO HSM lens? Auto-focus works with this lens on my Nikon D40X. On the D5500 it toggles between MF and AF. Video of what I ...
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3answers
98 views

Why doesn't focus confirmation appear in AI-servo mode?

Camera: Canon 700D Lens: EF-S 55-250mm STM So far I have been shooting still subjects. But recently I wanted to photograph moving people (skaters). I changed the AF mode to AI-Servo (as skaters are ...
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1answer
54 views

How can I use AF+MF on Fujinon lenses with hard stop focus rings?

Fujifilm cameras have an AF+MF mode which autofocuses when the shutter button is half-depressed, then lets you correct it using the focus ring. However, some Fuji focus rings have hard stops, so you ...
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0answers
31 views

How do I lock focus in live view with a Tamron 17-50 2.8 VC on Canon?

How do I lock focus with my Tamron 17-50? I have separated the AF-ON button to lock focus, but when I move the camera to recompose the picture, the lens tries to refocus again. I see that this ONLY ...
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2answers
61 views

Canon 6D not taking pics in AF

I just got a used Canon EOS 6D and I have a Tamron AF 28-75mm F/2.8 Macro Lens. What I have noticed is that when I try to take a picture and have the lens switched to AF mode it won't work if I use ...
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2answers
159 views

What focusing points are used with a Sony A6300 camera + LA-EA4 lens adapter?

I'm about to acquire a Sony A6300 e-mount camera. I wish to use various A-mount lenses with it. Sony sell their LA-EA3 and LA-EA4 adapters to interface A-mount lenses with e-mount cameras. The LA-...
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1answer
84 views

Bad focus. Is it me or my body (D7000)?

So I have a D7000. Grey market, which I didn't find out until after I had to send it in to get serviced. And it's never felt as...sharp as it should be. I always assumed it was just me. I am going on ...
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2answers
132 views

Nikon focus and recompose: identifying behaviour on different models

My Nikon D3000 refuses to take a picture if I focus and recompose with the AE-L/AF-L button set to "AF ON". (The focus point is on an out-of-focus part of the image after I recompose, so the shutter ...
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0answers
46 views

How can I increase my compact camera's suboptimal autofocus accuracy?

I own a Canon G1X compact camera which is quite good in my expectations, except that I cannot really be confident in its autofocus accuracy especially in non-optimal light conditions. Manual focus is ...
1
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1answer
146 views

How do I enable back-button AF on the 760D

I have an EOS 760D (recently upgraded from a 30D - yay!), and I'm can't find the custom function that allows you to use back-button AF. Does the 760D have this feature at all or has it been omitted? ...
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2answers
67 views

How can I improve my soft-focus shots out of a moving vehicle?

I was shooting with a shutter speed of 1/4000, f/7, ISO 800, using a 70-300mm telephoto lens. I have been shooting through the windshield of my SUV. Is there a filter I can use to help me get better ...
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0answers
64 views

Difference of auto-focus motor?

What is the difference of ultrasonic motor, stepper motor, and electromagnetic drive? Which one of these are lens-based or screwdrive? What are the advantages of lens-based servo over screwdrive and ...
2
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1answer
64 views

What are the (dis)advantages of moving the entire lens for focusing vs. only parts of it?

There's a lens adapter available that adapts Leica lenses to Sony mirrorless cameras. It's called TECHART PRO. The key feature is that it allows to use autofocus with the manual lenses. This works by ...
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2answers
93 views

How do I disable autofocus on my Nikon with a Sigma 10-20, which has no manual focus switch?

Just purchased a Sigma 10-20 f/4-5.6 DC HSM lens. In attempting to capture astrophotography, the lens continuously tries to find a focal point in the sky, and doesn't. So I attempt to turn it to ...
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4answers
325 views

Why does holding the focus and recomposing also affect the brightness of my photo?

Let's say I try to take a picture of the following scene: a nice, blue river on the bottom and a solid, grey building in the middle. It is a sunny day and I am in a large distance, so both "objects" ...
2
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2answers
325 views

What is the best focus setting for a group photo in manual mode?

I have a Canon 5D Mark III. I understand the depth of field issues taking group photographs at a wedding, but I am concerned the guests at the extremities might be less in focus than the centre if I ...
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1answer
105 views

Can an off-centre AF point be as sharp/sensitive as a centre AF point?

What is the focal plane for an off centre AF point? Is it the same focal plane as centre AF point? Can off-centre AF point be as sharp focus as the centre AF point? If not, will the sensitivity of ...
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2answers
211 views

Fast-focusing point and shoot camera?

I mainly take pictures of my grandkids playing, some scenery and birds. I am looking for an autofocus type camera that has a good zoom, one that will shoot quickly in low light situations. I miss a ...
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0answers
56 views

Autofocus not working on AF-S 35mm 1.8 DX with Nikon D3100

I haven't been using my camera very much over the past few months. The few times I've pulled it out, I noticed that the autofocus doesn't work when I put on my 35mm prime. I tested my 55-200mm and 18-...
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2answers
190 views

How to more effectively stay in focus with a wide aperture (50mm/1.8)?

I've been experimenting with street photography lately and - while I'm getting some decent shots - my biggest pain point is staying in focus. For example: With the following subject, I nailed a ...
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2answers
114 views

How many autofocus points in iPhone 6 camera

I have seen that high-end SLR camera tout the number of autofocus points they have. How many AF points does the iPhone 6 camera have? I have not seen any discussion on it except for "focus pixels".
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1answer
64 views

Focus issue in D810 after repair

Just got my D810 back from Nikon repair for a USB port problem. The camera was reset completely, including all my settings, date, etc. It has the latest firmware. After doing my usual setup, I used ...
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1answer
176 views

Why is my D7100's auto focus not working?

Recently my Nikon D7100 has stopped auto focusing. It's with the AF-S 50mm f/1.8G lens (my only lens). Yes, all the switches are set to auto, and I've done a reset. The autofocus assist light doesn't ...
2
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3answers
150 views

Why isn't my DSLR focusing accurately on a fast-moving subject?

Here is a photo I took earlier today: I did my best to track him down the hill and fire off as many shots as I could. Some turned out fine and in focus but the better ones like this one didn't. My ...
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2answers
152 views

Why does a manual focus lens have an autofocus motor?

Can someone explain to me why the Rokinon 24mm lens has a focus motor? Quoting from LensHero's page on the lens: Generic motor built-in focus motor From what I understand, only autofocus lenses ...
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1answer
141 views

Autofocus points in Mirrorless Cameras

Some mirrorless camera such as Sony Alpha 6300 has a lot of AF points (425), whereas flagship DSLR like Canon 1DX Mark II "only" has 61 AF points. Nikon D5 has 153 but it is still way lower than this ...
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2answers
197 views

How important is body microcalibration feature?

I'm considering buying a Canon 760D / Rebel T6S but it lacks autofocus microcalibration. It's an expensive camera and all upper models including the 70D offer it - so is it something that I can ...
7
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1answer
917 views

What is Nano USM and how does it compare to an STM or USM lens?

The Canon EF-S 18-135mm f/3.5-5.6 IS USM has a designation of Nano USM on the lens. What does this mean? What are the advantages of having it vs STM or USM? We have a terminology thread that usually ...
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2answers
255 views

How can lens cause consistent front or back focus?

I can understand body focusing problems, but I can't imagine why lens might cause front or back focus. I have two third party manufacturer lenses for my Nikon: one is front-focusing, the other is back-...
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1answer
75 views

Nikon Lens: A (Auto-focus) vs. A/M (Auto-focus/Manual)

I have two lenses which are 18-140 VR and 50 1.8G. On the 18-140 VR I got a button showing A and M while on the 50 1.8 I got a button showing A/M and M. I understand that A is for auto-focus and M is ...
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3answers
118 views

Why did my D5500's autofocus stop working?

My Nikon D5500 will no longer autofocus. It is a brand new camera with hardly any use. My neighbor, who has vast experience in photography, attached the macro lens, took a few shots, and then it ...
2
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1answer
59 views

How do I achieve autofocus while zoomed in on a face, if surrounding elements hold more contrast?

I recently bought a new camera, a Panasonic FZ1000, and noticed on more than one occasion when I was photographing my wife in a posed situation, and I choose to zoom in a little for the shot, the ...
2
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2answers
151 views

For those that can afford fancy teleprimes is it preferred to use AF or MF for birds?

Context I'll be using a Nikon 300mm/f4 on my Sony a6000 and seeing what birds I can get with it. The Sony 55-210mm is what I've been using but it lacks the reach and native teleconverters. ...
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1answer
241 views

How do I auto-focus an EOS M when stopped down to kill the ambient?

I'm trying to do take some portraits with two off-camera strobes. I want a dark background, so I'm using a high f-stop and high ISO to kill the ambient, relying on the strobes to light the model. But ...
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2answers
146 views

Is it possible to use more than one focus point on the Nikon D3200? [closed]

When focussing with the D3200, is it possible to select more than one focus point? If so, how?
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2answers
76 views

Fine tuning a lens focus [duplicate]

I just got a 35mm f/1.4 lens and wanted to see if it has any focus issues to be fixed. So I got this kit and not sure what exactly I should have done but I focused on the middle of that bar code like ...
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0answers
46 views

Why can't my Canon T5/1200D focus on my subject? [duplicate]

I try to take a basic picture of the baby laying on the couch, the focus goes in and out over and over won't snap the picture, when/if it does its blurry? Can't get a simple quick pic of the baby?
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1answer
130 views

Does the EF-S 18-55 STM make noise when it autofocuses? [closed]

I'm planning on buying a Canon 70D with the kit lens, an 18-55mm IS STM lens, to film tutorial-style videos (and for other purposes as well). I know that sometimes you can hear cameras autofocusing in ...
2
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2answers
169 views

Why doesn't autofocus work after using manual focus for a while on my Nikon DSLR?

I bought a Nikon D3200 DSLR with 18-55 and 70-200mm lens. I was taking photos for week in autofocus mode, where I have to press shutter button halfway to focus. And then I switched to manual, where I ...
3
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3answers
199 views

What is AF-L needed for? [duplicate]

After quite a lot of reading even, I am not being able to grasp the rationale behind the AF-L part of AE-L/AF-L button on Nikon D5300. If the camera is set to AF-C, then the concept of locking focus ...
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3answers
263 views

Is it normal for phase-detect autofocus to be inaccurate with a Canon EOS 750D and EF-S 18-55mm lens?

I'm using an EOS 750D with an EF-S 18-55mm IS STM lens. I often have trouble getting accurate focus using the viewfinder autofocus. Live view autofocus works fine. Here are two crops of the same ...