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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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How can I make my Coolpix focus after I'm in place for a time-delayed self portrait?

I have a Nikon Coolpix S9100 camera I am trying to take few self-portraits by setting the self-timer and then going in front of the camera, however all the pictures come out very blurry. I am aware ...
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1answer
3k views

What happens to a lens when you turn the focus ring during AF mode?

What happens to a lens when you turn the focus ring during AF mode? I have read that this causes damage, or can cause damage. But what is actually happening? I've done this recently with my Canon EF ...
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3answers
883 views

Is there a Canon equivalent for Nikon's AF-ON focus system?

I'm very new to photography, and have been reading a lot about concepts and techniques. Yesterday, my brother gave my kid a gift of a professional photography session. I saw the photographer had Nikon ...
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3answers
1k 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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1answer
4k views

Why is my Canon Rebel T3i delayed 10 seconds or more before image capture?

I am brand new to photography and this camera. Had the smaller lens on and the shutter seemed fine. Tried the larger lens (I bought a kit) which was 200M. Played around with settings, also tried the ...
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2answers
873 views

What does this switch do on my macro lens?

There is a switch on my Canon 100mm USM Autofocus Macro Lens that switches between 0.32 mm and 0.48 mm (I think those are the numbers I dont have my camera near me). What do these numbers mean and in ...
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2answers
229 views

Nikkor 70-200 2.8 VRII - Does Autofocus <5m really work?

some days ago I daring duck had approached while I was taking photos of her and her friends in a pond. I was testing my new 70-200 2.8 VRII and I was a bit worried about the autofocus while working ...
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1answer
404 views

Do mirrorless cameras focus less or more accurately than SLRs under low light?

How do the following compare in terms of autofocus accuracy for night photography: Mirrorless cameras like the Sony NEX-5R, in hybrid autofocus mode. The NEX-5R, in contrast-only autofocus mode. A ...
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2answers
4k views

Can a drop of a camera+lens cause AF calibration issues on either — or both — the lens and the body? What are the mechanics involved here?

My question is, if you drop a camera, and you think you might have an AF issue, what are the mechanics involved that might cause a mis-calibration? I can imagine that the lens has movable parts -- ...
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2answers
812 views

How to improve the PowerShot G12 shooting speed?

I have been using a Canon PowerShot G12 for about a year, and find it incredibly slow. In full auto-mode, with good lighting conditions, I feel the G12 regularly takes close to 0.5 s between the time ...
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1answer
3k views

Nikon D5100 Focusing Issue

The issue I have had is where the camera tries to focus and cannot focus. It just zooms in and out constantly and no matter what I do it will not focus and fire. The only way I have found around this ...
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1answer
428 views

How can a teleconverter allow manual focus lenses to autofocus?

I've found that some discontinued teleconverters, such as the Pentax F 1.7x AF Adapter and Nikon TC16A, enable autofocus with manual focus lenses. How is this possible? Does this system have any ...
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2answers
181 views

How advanced is phase detect AF for bird photography compared to contrast detect AF?

My first and only camera is a panasonic Lumix G5 with a panasonic 45-200mm. I wanted to have a first hand experience and decide if I want to switch to aps-c dslrs, but I never had an opportunity to ...
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1answer
1k views

What does AF -0.5 EV sensitivity mean? Or -3EV in Canon 6D's case? [duplicate]

I know that it stands for Exposure Value, so my 6D focuses in 2.5EV worse light than a 600D. But it's relative to... what? What makes it meaningful? What's the "base unit" for AF sensitivity?
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3answers
269 views

Why won't Nikon V1 autofocus with a close up filter attached?

I have a Nikon V1 with a 10-30 mm lens and recently purchased a +10 filter for close up work, but the camera won't focus when i use the filter. Am I doing anything wrong or is this a limitation of the ...
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3answers
2k views

Where is Canon 1100D autofocussing in low light low contrast conditions?

It's obviously my fault for living in the UK and expecting to want to enjoy my bird photography in grey January afternoons, but, I would appreciate some opinions on the following. I took 150 shots ...
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2answers
789 views

All my photos were blurry

I recently did a shoot of a baby and my 6 year old son, and I got some fantastic shots that were super sharp. I then did another shoot of a 6 year old and toddler and every single photo was slightly ...
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1answer
498 views

I almost cannot switch to manual focus on my Canon 17-40 f/4 L lens

Usually troubles with autofocus are related to a non working AF. I've got the opposite issue: AF is working too well. Actually, it is ALWAYS working, and I cannot turn it of. Even when I switch to ...
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2answers
4k views

Are there solutions to limitations on using back-button AF on Nikon D3100?

I have started to use my D3100 with my AE/AF-L button set to AF. So in other words I use this button instead of the half press shutter button to AF. I'm new to this technique and came across it here ...
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3answers
363 views

Do focus area modes matter if shooting in manual focus?

It seems my camera lets me change the focus area modes (e.g wide, center or spot) even when I am shooting in manual focus so I am trying to understand if area modes matter even if the camera is in ...
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2answers
3k views

What is a Dual pixel autofocus?

I have seen the term "Dual Pixel CMOS autofocus" used by Canon (specifically in relation to the 70D). What is it? Is this Canon specific technology? Are there equivalents in other manufacturer's ...
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2answers
255 views

lens care: compressing lens without full-time manual focus when camera is off?

The lens manuals for my lenses without "full-time manual focusing" warn not to use the focusing ring when it's in Auto-Focus mode. I assume that even applies when the camera is off, but am I being ...
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2answers
516 views

How To Fix Badly Functioning Shutter Release-Button?

I have a compact Pentax OptionM10 which I bought in 2006 and sometimes shutter-release button works only when pressing it on edge and under specific angle, but mostly as I apply little pressure which ...
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1answer
281 views

Are there cameras that autofocus during an exposure?

The origin of this question is related to panning. I was trying to explain why panning is more effective for subjects moving across your FOV at right angles, vs. a subject whose distance to the ...
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1answer
163 views

How to test the autofocus system before asking for support?

For outdoor usage I got an Olympus TG-2 compact camera. Various tests claimed autofocus: 'quick and mostly accurate' - at least I could not find any that described problems. Now, I know that I cannot ...
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1answer
2k views

What settings affect how the focus points are displayed for my 7D?

My Canon 7d is about 2 months old. I used it for a shoot in DC, and it just isn't behaving as expected. When I try to focus, I get little black boxes in the focus frame. They used to be black, with ...
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2answers
139 views

How can I be sure a lens will autofocus on my Nikon D5000? [duplicate]

Possible Duplicate: What type of lens will auto-focus on Nikon bodies without a focus motor? I have a Nikon D5000. For Nikon Lenses I know that I have to buy ones that are AF-S. Easy ...
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2answers
2k views

Is it really better to not half-press to focus with the Fujifilm X-Pro 1?

Fujifilm's new camera uses contrast-detect autofocus, and the current Internet hand-wringing is over whether this is a horrible critical flaw or not. As often happens in such discussion, a bit of ...
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3answers
2k views

Is the Canon 600D Al servo autofocus up to the task of following moving subjects?

Has anyone tried shooting fast moving subjects (birds, cars, running animals) with Canon EOS 600D using Al servo autofocus? I am thinking of getting this DSLR but the internet reviews are a bit ...
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3answers
1k views

Is focusing problems on Sigma lenses still a problem on a Canon body?

I am considering purchasing the Sigma 70-200mm f/2.8 EX DG HSM II Macro Lens. The problem is that many reviews point out that the lens has front focus problems, at least on a Canon mount. But those ...
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1answer
295 views

Why 5-50x focal length for autofocus micro-adjustment?

When we do an AutoFocus Micro Adjustment session, the general opinion is to set the focusing target at 25 x focal length (or somewhere in the range of 5-50 x focal length). Why is so? What happens if ...
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1answer
169 views

Is it normal for live view to freeze when focusing with a point & shoot camera?

I went to a Best Buy recently and tried a few point-and-shoot cameras, among which the Canon G15, Canon SX260, and Canon SX50. With all of them, I noticed that the live view freezes for a short time ...
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1answer
259 views

How can one measure the autofocus performance of a lens?

Many of the lens reviews tend to comment on their autofocus performance, but they seem to be mostly subjective in nature (fast, slow, hunts around etc). I understand that the autofocus performance is ...
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1answer
529 views

Why doesn't the focus assist light get triggered on a flash connected via a Pocket Wizard TT1?

I have a Pocket Wizard TT1 and TT5 which work fine. I mount the TT1 on the camera shoe and the TT5 fires my remote flash ETTL fine. I now want a focus assist light, so I set a flash (580, 430 or ...
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2answers
223 views

Why are phase detect lenses adapted onto contrast detect bodies so much slower?

The Sony A7 is able to adapt almost any type of auto-focus lens (Canon/Nikon/etc) and use autofocusing, but the auto-focusing is much slower than the same focal lengths native for the A7. Why would ...
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3answers
495 views

What can I do when autofocus suddenly starts blocking at around 2m on a Nikkor AF-S 28-70mm 1:2.8 D?

I had this lens for quite a few years now, it used to work as expected. I didn't use my stuff for a few months, maybe 6-8 months. I just bought a D600 and tried to use them. The AF does not work as it ...
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4answers
448 views

How to take a photo of defects on a mirror?

Taking a picture of a reflected image of object is depicted in this image. Camera focus is on the image of a piece of paper. Besides the depth of field (cheap Panasonic DMC-FX8 in makro mode, ...
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3answers
467 views

How to correctly focus on the background person in a shot?

I tried to take some portraits of my sister-in and her fiance earlier in a sunny, green park. I took a few pictures where the fiance is closest to me but turning to look at his wife-to-be who is ...
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2answers
426 views

How can I find which lenses have “Continuous manual focus”?

Canon lenses with USM auto focus can be called "continuous manual focus" (at least some). By this I mean that you can override the AF without switching it off. I've found this very handy, and I often ...
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2answers
582 views

Why is AF performance different in automatic and selective mode?

How often do you use AF in selective (SEL) mode? The reason why I'm asking is that I've noticed that on a Pentax body (K10D and K-5) the AF is a lot more accurate when in AUTO mode than in SEL mode. ...
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4answers
306 views

Which one is better - more cross-type sensor or better sensitiveness of cross-type sensors?

What makes better sense for situations like: low light, sports/action, wild life? More cross-type sensor on AF (like Canon does) Or more sensitive cross-type sensors (like Nikon does)
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3answers
306 views

How to take clear photographs with DSLR

I just bought a Nikon D5200 with the 18-105mm lens and I have taken this flamingo photograph but can't see their faces properly and If I zoom in a little bit the image is pixelated. I have tried ...
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3answers
8k views

What does infinity focus mean and when should I use it?

All my lens have focus ring where at the end there's an infinity symbol. What does that mean? If I'm taking landscape shot and what everything from near to far to be in focus, do I use infinity? Or am ...
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4answers
348 views

Will the Nikkor 85mm f/1.4D be a good fit with the D60, even though it doesn't autofocus?

I've been using a Nikon D60 for over a year now, and thinking about upgrading the stock lens. I am thinking about this lens: Nikon Telephoto AF Nikkor 85mm f/1.4D IF Autofocus Lens But on the page ...
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2answers
768 views

Do separate autofocus motors exist for entry level Nikon DSLRs?

I have a Nikon D3200, which doesn't have an autofocus motor. Therefore, I'm mostly deterred by lenses that don't have focus motors in them. But the ones that do have it are much more expensive. Take ...
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2answers
299 views

In which situtations are cross-type autofocus points better?

I understand that the difference between "regular" autofocus points and cross-type ones is that the latter consist of two diagonal "regular" ones. I also understand that this is better. But what are ...
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2answers
677 views

How important is auto focus and aperture control in a macro setup?

I'm thinking of starting some amateur macro photography, and I'm not sure I want to go with macro lenses, due to their price. I currently have the following lenses: Canon EF 50mm f/1.8 II Canon EF ...
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2answers
135 views

Does the Canon AF/MF switch actually do anything on L lenses?

I picked up a second hand 50mm f/1.2L lens recently with not a scratch on it. I've noticed that when the lens is set to MF, the autofocus on the camera (6d) still works. As a workaround I have ...
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2answers
767 views

How to tell whether a lens has an autofocus motor or not?

I have to buy a lens and I have a Nikon d7000. I want to know which lenses have AF motors and which do not, as the D7000 has an AF motor built into the body. How do I tell whether a lens has a motor ...
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2answers
487 views

How AF works with lenses f/2.8 vs f/4

I read following in a web site (http://realphototips.wordpress.com/tag/ai-servo/) Lenses with maximum apertures of f2.8 allow the camera to use all high precision sensors. In low light or other ...