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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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112 views

Why does my photo become blurry in manual focus? [on hold]

When I'm shooting in auto-focus mode, the pictures that I got are crystal clear but when I'm using it in manual-focus mode with the same conditions, the photos become blurry. I also have a question ...
0
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3answers
60 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
votes
3answers
8k views

Why does my Nikon D3100 no longer auto-focus via the viewfinder?

My Nikon D3100 out of the blue cannot focus correctly. It seem the that the focus motor always stops at the end of the run (Infinity) and cannot lock on the target, thus cannot release the shutter. I ...
11
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1answer
336 views

At which lux level do the Nikon 1 cameras switch from PDAF to contrast-detection?

The Nikon 1 cameras are famous for being able to track focus with their on sensor PDAF. But the story goes that if light is low, it will switch to contrast-detect only and will not track focus as ...
2
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1answer
45 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
1k views

Nikon D60: Autofocus of two AF-S lenses not working anymore after using another lens

I have used my Nikon D60 for about 6 years now, with AF-S DX NIKKOR 18-55mm f/3.5-5.6G, and AF-S 55-200mm Nikkor f/4-5.6G lens, and the autofocus has been working fine this entire time. However, I ...
16
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2answers
26k views

How does focus work on mobile phone cameras?

How does focusing work on mobile phone cameras? Aren't their optics simple enough to not have any moving parts whatsoever? If so, how come most smartphones have an auto-focus, and with various ...
2
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2answers
127 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. ...
42
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4answers
22k views

What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?

This is a follow-up to Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers? I'm doing this to separate the AF aperture requirements from the linked question above. My goal ...
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1answer
218 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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1answer
66 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 ...
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1answer
94 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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2answers
92 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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1answer
95 views

What is the Autofocus type in Nikon D3300?

What is the autofocus type in Nikon D3300, Is it phase detection or contrast detection ? Or both ? If both then when is phase detection used and when is contrast detection used ? I was looking in the ...
0
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1answer
194 views

Why did my Canon 1000D stop working in full auto mode, when it still works in P, Av, etc.?

It's my 7th day with my second hand Canon 1000D. But now, it's stopped capturing pictures in full auto, portrait, close-up, landscape, night portrait, sports, and flash off modes when used in ...
2
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2answers
58 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 ...
2
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2answers
140 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 ...
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0answers
38 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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3answers
117 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 ...
50
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5answers
19k views

What is the best way to micro-adjust a camera body to a particular lens?

I have a Canon 7D with a 50mm f/1.4 lens, and I think the auto-focus of the lens is off. How can I test and adjust this reliably? Will this approach work with all of my lenses? If I had a different ...
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2answers
94 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 ...
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1answer
53 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 ...
6
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5answers
701 views

Will I regret buying an older lens that doesn't autofocus or have image stabilization with my Nikon D5000?

I am planning to buy a Nikon Normal AF Nikkor 50mm f/1.8D Autofocus Lens. It doesn't autofocus on the D5000 but for the price, I think it's a good choice of lens for portrait. What do you think? ...
12
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3answers
20k views

Will the Nikon D3100 autofocus with the 50mm f/1.8D lens?

I have the Nikon D3100 and was wondering if the autofocus on the Nikon 50mm f/1.8D lens would work with it. I've read that the AF is not compatible with the D5000, and that the AF is rather slow in ...
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3answers
159 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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1answer
236 views

Pictures start in focus then go out of focus?

I was recently shooting some surf after a session with my 7d and Tamron 18-270MM F/3.5-6.3 Di II VC PZD. I started shooting while he was in focus, then as he got to the main part of the maneuver the ...
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3answers
132 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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2answers
51 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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0answers
36 views

What to do when my Nikon AF-S lens won't autofocus? [duplicate]

My Nikon Lens will manually focus but not auto focus. I have tried another lens on my camera body without issues and I have put this lens on another body and it will not auto focus there either. I ...
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1answer
135 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
46 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.
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1answer
50 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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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 ...
29
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3answers
2k views

What is the difference between a linear and a circular polarizer?

When I bought my polarizer, a friend told me that I should get a circular one, because the linear ones can mess with the autofocus. Is this true? What should each be used for?
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1answer
83 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
80 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
199 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 ...
21
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3answers
2k views

Why am I allowed to turn my focusing ring beyond infinity?

Is there a good reason why I can turn the focusing ring on my lenses beyond infinity mark on focusing scale? Following recent questions here and here, it sounds like a real usability issue. ...
0
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2answers
5k views

Does a Canon STM lens autofocus more quickly and accurately on a high-end camera body?

There are incredible reviews on the new Canon STM lenses: https://www.youtube.com/watch?v=ho0hOhRSuHk Does autofocus perform better on a 7D body, compared to an entry-level 700D body, for example? ...
0
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0answers
37 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
35 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 ...
2
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4answers
728 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 ...
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3answers
110 views

Does having an autofocus motor in body vs lens affect image stabilization or image quality? [duplicate]

In terms of image quality and image stabilization, what difference does it make to have an autofocus motor in-body vs.in-lenses ? The question How do camera body motors compare to in-lens motors for ...
3
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1answer
79 views

What is “hybrid AF”, and how does it compare to other autofocus technologies?

I've heard of some new cameras — particularly mirrorless cameras — with a feature called "hybrid autofocus". What does this mean, and how does it relate to the traditional approaches of contrast and ...
0
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1answer
63 views

Does the Sigma 70-300 AF-D lens have an autofocus motor?

If I buy an AF-D lens, the Sigma 70-300mm for Nikon D3200, from Amazon, will it have an autofocus motor? There's a listing with "Built in Motor for Nikon". What does this mean?
3
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4answers
2k views

Is focus hunting “normal behavior” for the Sony SEL18200SE?

I recently bought an NEX-6, the 24mm F1.8 (SEL24F18Z) lens, and the black 18-200mm F3.5-6.3 (SEL18200LE) lens. I love the 24mm lens, but I'm having a what I believe one would call a "focus hunting" ...
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2answers
294 views

Can I filter by autofocus in Lightroom?

Does Lightroom let me filter photos by whether they were manually focused? Or is this information not even stored in the ARW metadata? (I'm assuming they were not lost during DNG conversion in ...
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2answers
325 views

Can I enable back-button focus on a 3rd-party battery grip for my Nikon D610?

I have set up my camera to have back button focus. Does this not carry over to the battery grip or is there a way to set that up as well. I have a Nikon D610 but I have a third party grip (vello ...
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0answers
54 views

Canon 6D Auto Focus Erratic Behavior

I have a 2 year old Canon 6D which I use primarily for landscape photography and taking shots of my grandkids. It exhibits a strange behavior at times when I lift it to my eye to compose a shot. ...
3
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1answer
77 views

How can AF adjustment be inconsistent across lenses?

How is it that sometimes a lens will work fine on a camera body without adjustment yet others need some AF micro adjustment tweaking. I would imagine that the accuracy of the AF system with regards to ...