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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.

learn more… | top users | synonyms

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70 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
111 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 ...
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1answer
59 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
64 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
61 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
61 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
74 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
310 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
181 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
95 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
169 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
44 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 ...
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2answers
174 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
86 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
53 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
105 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 ...
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3answers
127 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
144 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
113 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
177 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 ...
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1answer
699 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
183 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 ...
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1answer
62 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
96 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 ...
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1answer
57 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 ...
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2answers
147 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. ...
4
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1answer
236 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
122 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
68 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
42 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
95 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
158 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
185 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
202 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 ...
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2answers
57 views

Autofocusing multi v single point at a party [duplicate]

Context I've shot at a party at night recently. I've used mainly multi point (continuous) tracking as it makes more sense, as random events may come and go. Question My friend suggests that I ...
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3answers
171 views

Is autofocus important for ultra wide angle lenses?

I want to know if autofocus is important for ultra wide angle lenses, for casual users. I mean, users like my mom. I don't mind about manual focusing, but I suspect that wide angle lenses will focus ...
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1answer
559 views

Why doesn't my “Nikkor AF” lens autofocus on my Nikon D3300?

I recently got a new lens for my Nikon D3300. I now have 3 lenses; the other two that I have came with the camera and work great but when I put my new lens on, it will only manually focus. If I go to ...
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1answer
90 views

Autofocus with canon EOS 1200d [duplicate]

Can my EOS 1200d autofocus with1.4x canon teleconverter and canon 300 mm f4 lens. What will be my maximum aperture using both of these.
0
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1answer
65 views

Good Photographs with Moto G2 Camera [closed]

I have got a MOTO G2 Mobile with 8MP front camera, usually i get best shot from my phone but is there any way so that i can capture best pictures with a mobile camera everytime?
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1answer
99 views

Using one focus point in autofocus mode - interval timer shooting - NIkon d7000

I was working on some selfportraits using interval timer shooting and I found that the camera focuses one of 3-4 shots on the subject. Obviously, it recognizes the face but most of the times, it has ...
2
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2answers
120 views

How can I turn off auto focus when using the remote with my Nikon D7000?

I have a remote with my D7000 and it's hugely frustrating that it auto focuses when using the remote. The whole reason I want it is for speed and to not move the tripod. I have looked through the ...
6
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3answers
427 views

Why isn't infrared AF assist beam the default when available (instead of irritating strobing)?

I have an entry level Canon camera with a built-in flash. When I try to photograph people at night the camera fires some pre-flashes to help with focus. While I do understand its necessity, some of ...
3
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2answers
103 views

Shallow DOF: continuous or single AF mode?

When I take a portrait with settings which result in a DOF shallow enough that the subjects' movements risk missing focus on the eyes, should I use continuous AF mode - is the continuous AF fast ...
0
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1answer
130 views

Canon 1100D auto focus issues

I'm having a rather odd issue with my Canon 1100D, whenever looking through the viewfinder to take pictures the auto focus will not work. I am unable to release the shutter, the same goes for manual ...
0
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1answer
202 views

Nikon D750 + Nikkor 18-35mm - How to enable full autofocus?

I recently got this powerful duet (before I had Pentax K-r), sadly I can call myself a total beginner even I used dslr previously... as I used it with auto mode. However I am learning slowly now, but ...
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0answers
41 views

What is the 4D autofocus and how is it different from the continuous servo in Nikon?

I just saw a new auto focus term 4D focus introduced by Sony in one of their cameras. How is it different from the continuous servo in Nikon ? Are both the same ? or totally different ? And what ...
0
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1answer
40 views

How can I make the 580EX II “probe flash” on a 7D MkII?

I've bought the 580 EX flash used, it's my first external flash. And I'm playing around with it to get some experience. One of the problems I've noticed in very dark environments is that the autofocus ...
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0answers
22 views

Why does AF mode go back and forth and not find focus while MF works perfectly? [duplicate]

It's the same with the Olympus 14-42 lens and with the Panasonic 45-150 - my Olympus E-PL3 rarely works correctly in AF mode; 90% of the time the focus goes back and forth before being secured in a ...
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4answers
765 views

Simply bad focus or too big aperture?

I have made a mistake with this image: ISO 400 | 1/1700s | f/2 I used manual Aperture mode and set it to F/2 (now I believe this is too much). Kids were one meter away. It was light cloudy ...