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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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I've dropped my 6d from about 4 feet up. how do I verify I didn't mess up something?

I was sitting at a wedding and talking to a friend animatedly. The camera flew out of my hand and landed lens first and then fell on it's body. My concern is that I messed up the AF or the IS. How ...
37
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3answers
11k 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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2answers
1k views

How does the eye-controlled focussing of the Canon EOS 5 work?

I just read that the Canon EOS 5 had eye-controlled focussing. How does this work? In this short article I found that it had to do with the coupling of infrared eye-tracking and the AF-point choice, ...
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2answers
62 views

How does auto focus tracking work in DSLRs

I thought auto focus tracking comes from the computation of image on the image sensor when I was using GF1, a MILC. The auto focus tracking was good. However when I use canon 6D, a DSLR the auto focus ...
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3answers
335 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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3answers
109 views

Blurry Pictures. Lighting fine.

I recently shot some family pictures for a friend's family event (thank god I didn't get paid for this job). The location was problematic with the light - very strong late afternoon light and I don't ...
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5answers
2k views

What is the best camera for concert photography? [closed]

I am interested in camera recommendations with a fast shutter and which are able to focus well in low light. The camera will be used for indoor concert photography where no flash is allowed.
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2answers
167 views

Focus in night photography

Another question related to the Olympus OMD EM5. I bought this camera to replace my Nikon D90 and I'm very satisfied with it. However, I find very hard to do the focus at night. With the Nikon D90, ...
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3answers
195 views

Why are my photos taken with the Sigma 18-50mm f/2.8 coming out blurred?

I'm new to photography, and I don't know why the pictures I'm taking are coming out blurred. Here's a sample image, taken with the Sigma 18-50mm f/2.8 on my Nikon D5200 at 18mm, 1/60s, f/2.8 and ISO ...
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2answers
31 views

How to shoot moving subject with Panasonic FZ 70/72

I would like to know if I act right. Scenario: moving subject (animal, airplane or sport scene). I get my bridge camera, a Panasonic FZ 70/72. I focus (with autofocus) the subject pressing half ...
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2answers
75 views

Which image processing algorithm does the contrast auto focus use to check the sharpens?

My read is that the contrast auto focus is using edge detection algorithms like laplace or sobel.
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1answer
241 views

What to do when autofocus on Canon 85mm f/1.8 not working?

My Canon 85mm's AF isn't working. But here's the thing, it recognizes there's a lens mounted, it gives focus confirmation, and I can even set the aperture, but it does NOT recognize that it's an AF ...
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0answers
67 views

What would cause an AF confirmation light to go on and off as I approach correct focus?

I'm using two cameras: Canon EOS 400D (Digital Rebel XTi) and Canon EOS 450D (EOS Rebel XSi). 450D was more heavily used than 400D. Not so long ago I noticed that 450D's autofocus system works not ...
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1answer
95 views

How to tell if a digital camera shoots quickly

In my experience, most (at least) older digital cameras take some time -sometimes even a second or so- from the moment you pressed the button to the actual taking of a photograph, especially when ...
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6answers
228 views

If I'm using only one focus point, am I doing it wrong?

Unless I have to shot a person or an object which moves, I set my camera to use only one focus point at the middle. It feels just more natural and so easy: when I need to focus on something which is ...
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4answers
3k views

Missing focus with Canon 50mm 1.8 lens - is it the lens or me?

I purchased a Canon EOS 650D and EF 50mm f/1.8 II lens. Unfortunately, the auto-focus seems to miss focus at f/1.8. I've tried setting it to single-point auto-focus: it is better, but still not good ...
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2answers
801 views

What technical reasons prevent Canon's new hybrid AF working with non-STM lenses?

Canon's new Rebel T4i (a.k.a. EOS 650D) has a new "hybrid AF" mode, which allows continuous AF during video, but only when used with one of the new STM lenses. I've seen chatter on the web forums ...
2
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4answers
14k views

What should I do when my Nikon AF-S lens won't auto focus?

I have a Nikon 35mm f/1.8G AF-S DX I bought for my Nikon D5100, it's only a couple months old, never been dropped or anything, and it all of a sudden won't auto focus. Anyone know if this is a simple ...
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1answer
35 views

Wireless Shutter Release Remote does autofocus before taking the snap?

I have Nikon D3000 and a wireless remote for it. I'm not sure about this thing: Suppose, I am keeping the camera on tripod where some birds will come. Then, I am setting my required zoom and other ...
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1answer
94 views

DSLR body without auto focus + auto focus macro extension tube set + lens without having auto focus motor but focusing screw = auto focus?

I've Nikon D3000. It died not have auto focus motor boot in its body. I've a lens having no auto focus motor within it. I saw some auto focus macro lens extension tube. Does that have autofocus motor ...
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2answers
116 views

How to focus manually with a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens?

I have a Nikon D3100, for which I just bought a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens. This is a CPU lens and works very nicely in auto-mode, i.e. when you let the camera set the focus. ...
2
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4answers
351 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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2answers
232 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? ...
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8answers
11k views

How can I focus in very low light with my Canon 60D?

I'm using a Canon 60D and would like to focus in low light. I know Canons — in fact, all cameras — can struggle here with auto focus, but I'm talking about light so low that I wouldn't be able to see ...
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2answers
119 views

What does it mean for a camera to be able to autofocus at EV 0 at f/2.8?

I know what it means for a camera to be able to autofocus at EV 0. As the answer to this question says, EV0 is the light level to achieve correct exposure with 1 second of exposure at F1 and ISO 100. ...
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4answers
4k views

What can I do if autofocus does not work but manual focus does?

Recently, the autofocus on my Nikon D3100 stopped working. The ring of the lens wouldn't even turn when I tried to focus. However, when switched to manual focus, the camera works fine. When I used a ...
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5answers
1k views

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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2answers
171 views

Is it true that cameras with larger sensors are more likely to mis-focus under low light?

I use a Sony NEX-5R, and my single biggest problem with the camera is that it often mis-focuses under low light. I shoot a lot of low-light photos, and I work around it by using manual focus. I have ...
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3answers
345 views

What does the AE lock button do that half-pressing the shutter doesn't?

The Sony A6000 has an AEL button, while Nikon SLRs have an AE/AF lock button. What do these do that half-pressing the shutter to lock focus and exposure, and then recomposing, doesn't? I'm used to the ...
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1answer
2k 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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0answers
26 views

AF points, focusing at f1.0-2.2 [duplicate]

I am considering the canon 5d mark iii or the 6d. Between the mostly negligible differences between those cameras, the AF point system of the 5d has many more "points". Having never really relied on ...
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1answer
2k views

Which Nikon DSLRs have an autofocus motor in camera body?

I have a Nikon D3000 and a lens which has no autofocus motor. But under the lens, I have found a screw which rotates with the focusing control. My D3000 does not have any autofocus motor inside the ...
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1answer
66 views

How can I confirm focus with a Nikkor 70-300 lens on a D3000?

Good day! I would like to have some suggestion from experienced photographers about following matter: I have a Nikon D3000 Camera. I bought a Nikkor Lens 70-300mm having not motor inside and unable ...
5
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0answers
174 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 ...
5
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2answers
225 views

Why can't I access Single Point Spot AF even when it is enabled on my 5D Mark III?

I have been using Canon 5D Mark III since long but somehow never been able to get across this thing. With the advanced 61 point focus system which the Mark III has, I have always missed the ability to ...
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0answers
29 views

Nikon 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 ...
2
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2answers
244 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
98 views

Learning from one's blurred photos: where was the focus point set?

After some shooting, I inevitably find that some photos (and by Murphy, often the best ones) have a blurred subject. Even if the shots are spontaneous and hence the subject is hardly static, I ...
8
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6answers
494 views

Why is the main sensor not used instead of the separate AF sensor to focus a DSLR?

From this answer I understand that the reflex mirror of a DSLR is actually not reflecting all the light, but it passes a certain amount on to the AF sensor. So if the reflex mirror can pass light, ...
2
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2answers
250 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 ...
2
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1answer
515 views

How do I make the focus point indicators stay long enough to select on the Canon 60D?

I have just switched from the Canon 500D to a 60D. Most of my work is property based, and this is therefore 90% internal flash shots where I often wish to pick out a particular spot for best focus. ...
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2answers
124 views

Autofocus icon is missing in Canon 650D, please help

Can anyone please help me in getting this icon back in my canon 650d
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2answers
120 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 ...
2
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2answers
184 views

Why does my Nikon D5100 suddenly have a 30-60 seconds delay before auto focus starts working?

I have a Nikon D5100 with the 18-55 kit lens. It was working fine till a few days ago. The auto focus used to work from the very next second after turning ON the camera. But now the auto focus does ...
2
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4answers
273 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)
11
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3answers
16k 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 ...
0
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0answers
33 views

Help is needed in Fixing Canon lenses USM's focus motor [duplicate]

I have the Canon EF lens, but the USM motor looks dead. I need help in order to get it fixed so I can use this lens again. Unfortunately a "focus by wire" system is used in this lens and I have no ...
0
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1answer
134 views

Why doesn't my Sigma lens autofocus if the subject is initially way out-of-focus?

I have a Sigma 150mm F2.8 EX DG OS HSM APO Macro lens mounted on my Canon 6D. Even if AF mode is set to minimum-to-infinity range, if my subject is way out of focus (too far or too near), like, say, ...
17
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3answers
942 views

Why don't cameras have autofocus points in the edges and corners?

On all the DSLRs I've used, there are never any autofocus points near the edges and corners. Why is that?
3
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2answers
2k 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 -- ...