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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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3
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3answers
538 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 ...
1
vote
2answers
506 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 ...
0
votes
1answer
72 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 stopped catpturing picture in full auto, portrait, close-up, landscape, night portrait, sports, flash off modes in autofocus mode. When i ...
7
votes
0answers
242 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 ...
3
votes
0answers
37 views

Where can I find information on the Pentax Q lenses serial protocol?

I'm searching for detailed information on the Pentax Q lenses (any, but I'm especially interested in the 5-15mm-lens) serial protocol, which controls focus/zoom/aperture. So far I have found nothing ...
1
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0answers
61 views

Manual and Autofocus not working on near field with Canon Rebel T3

I dropped my camera on a tile floor the other day and everything appeared fine. My wife tried to take some close up pictures of a gift today and found that the Auto Focus wouldn't work on close field ...
1
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0answers
90 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 ...
0
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0answers
31 views

Searching for autofocus lenses for 2/3" sensors

Can someone name me manufacturers of exchangeable (preferably autofocus-)lenses for 2/3" image sensors, apart from industrial lenses (because they generally dont have autofocus)? Because i want to use ...
0
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0answers
94 views

Why is the autofocus on the D5200 so slow and buggy

Why is the Nikon D5200 autofocus speed so slow. And why is it even slower in Live mode? I tested two different D5200 and both had a slow and laggy focus, even with stock lens. They are very slower ...
0
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0answers
60 views

Are there any known focusing issues for the Nikon 70-200 2.8 VR and if so, how to compensate for them?

I have recently rented this lens for my D610. I feel that it is just off when auto-focusing? Takes kind of long to focus and does not always seem to focus on the subject I am trying to get in focus. ...
0
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0answers
122 views

Which focus points on the Nikon D750 support f/8?

The Nikon D750 has 11 autofocus points rated up to f/8. Which ones are the f/8 points?
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0answers
88 views

Apertures required to enable autofocus on Rebel T6s/T6i in Live View?

Your article "What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?" is most useful. Would the new Canon autofocus technology, in the ...
0
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0answers
166 views

Canon 750d very slow focus speed

I've a new EOS 750d (T5i), with several Canon lenses. Before, I used to have a 450d. I've noticed that the camera is very slow to focus, the motor is audibly struggling, and focusing on an inanimate ...
0
votes
0answers
86 views

Contrast detection AF not working?

What are the possible reasons why my Nikon D3300 won't focus properly at all on live view? It works perfectly when using phase detection (or when looking through the viewfinder), but when I start ...
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0answers
65 views

Nikon zoom lens troubleshooting

My Nikon D5100 squeals and won't photogragh on its 55-300mm lens beyond 80mm. I've tried turning autofocus on, taken out & reinserted battery, and changed memory cards.
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0answers
62 views

When does the Sony NEX-5R use release priority?

As I understand it, focus priority delays the shot till focus is achieved, while release priority potentially takes a mis-focused shot. Wikipedia says that release priority is usually used in ...