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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 do you take pictures in a dark room?

I wanted to practice photography with flash so turned off the room lights and tried to take a photo but there is a circle that shows in viewfinder when the camera has locked the focus on something, ...
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3answers
389 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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3answers
97 views

How should I handle auto focus on a moving train

I have a Nikon D3100 with Nikor 55-300mm lens. I do railway photography and especially when light is less than optimal, the camera's auto focus has hard time latching onto an oncoming train. (I take ...
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2answers
160 views

Does this test chart show that my kit lens front focused?

I just bought me a Nikon D7100 with 18-140 kit lens. When I used focus test chart page 18 to test my camera and lens I got one of following result at 35mm/f4.2. I used Nikon's ViewNX2 to open the raw ...
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3answers
268 views

Auto focus vs Single Continuous/Point focus

I'm using a D600. Sometimes, having the ability to select my focus point is good. However, in certain situations, moments can be lost when you're framing or moving the focus point to the subject in ...
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3answers
119 views

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 ...
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2answers
88 views

Are extra auto focus points expensive for the manufacturer?

Having a lot of auto focus points is a feature associated with expensive camera bodies. There are of course different types of points like crosstypes and also different sensitivities, but lets ...
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2answers
847 views

Auto-focusing problem on a Canon 500D with a EF-S 18-55mm 1:3.5-5.6 IS(standard kit lens)

I'm having problems with the lens. I've tried auto-focusing with my other lenses, and it works fine. It can only auto-focus one way, i.e. the focusing ring is still able to move, but only able to turn ...
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1answer
147 views

What is the difference between touch focus and autofocus?

I have a cheap Chinese Android phone, a Landvo l200 based on MTK68XX chip. It claims to have a 13MP touch & autofocus camera. I wanted to know how this autofocus feature differs from touch focus ...
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1answer
344 views

Why does the camera say Subject is too Dark and refuse to click the shutter

I was trying to take some nice pictures of the Toronto city skyline from the shores of Lake Ontario under a full moon night. Now I put my nikon d5200 on a tripod and set f/4 and shutter = 30 sec. I am ...
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2answers
3k 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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3answers
3k 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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2answers
165 views

Should I always use point-autofocus and spot metering while shooting a small restless bird in a bush?

I am a beginner and I am finding more and more images to be out of focus or grainy when viewed on a computer screen, compared to the camera LCD. Could anyone give a step by step listing of the ...
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1answer
76 views

Do mobile cameras ever vary f stops?

I've been trying to get my head around the camera in my newly-bought Chinese mobile phone. I wonder how focusing actually works in these kind of phones. I imagine that in the standard context of ...
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1answer
491 views

What is the purpose of Quick Mode focusing in live view?

What is the purpose of Quick Mode (found on some Canon DSLRs) focusing in live view? To me it seems like a bad blend between live view and viewfinder mode that really doesn't cut it. Of course it's a ...
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1answer
650 views

Has D600 AF fine tune option? Can I fix backfocus of my lens on D600?

I know that the D800 has an option to tune AF. Does the D600 have this option, and does it work as well as it works on the D800? Can I fix a back-focus issue with my lens on a D600 without sending it ...
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2answers
52 views

Superzoom unable to autofocus at infinity at mid-zoom focal lengths

I have an inexpensive "superzoom" camera that functions properly and fills my needs but has one problem I seem unable to resolve. It is a GE Power PRO X500 camera with which I have taken several ...
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2answers
204 views

How to set AF in night [duplicate]

Possible Duplicate: How does one focus for landscape photos in very dark conditions? Recently I went on a night forest safari trip with my Canon 1100D. I had put the camera in manual mode ...
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1answer
3k views

How to fix inoperative autofocus in Canon 70-200 F4 L USM?

This lens has been sitting on the shelf for years and I recently hauled out my DSLR to play with it. Turns out the autofocus no longer works. I'm wondering if there's any kind of remedy for this short ...
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1answer
85 views

How do prime lens allow variance of focal length when focusing? [duplicate]

If the definition of prime lens says that their focal length is fixed, then how come you can still alter the focal length when focusing? (either MF or AF)
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1answer
77 views

Is the Canon 7D compatible with all EF and EF-S lenses? [duplicate]

Are all the lenses compatible with 7d? Especially EF-S? Anyone having a autofocus issue with 55-250mm IS lens?
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1answer
83 views

Lumia 1020 Auto settings information?

What is the value of auto in lumia 1020 compact phone. I mean the value of iso, we can manually vary from 100 to 4000. and shutter speed from 1/16000 to 4s. brightness value -3 to +3. Every control ...
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1answer
85 views

Advice on Canon 7D Autofocus problems?

So I've had a Canon 7D for about 3 years. It's started to develop what seems like a lot of trouble with the autofocus over the last couple months. I don't recall having any such issues in the past, ...
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2answers
408 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
153 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
333 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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2answers
571 views

Nikon d7000 will not auto focus

Nikon D7000: When I press down on the shutter release my camera does not auto focus with any lens. I have checked and it's NOT on manual I have tried resetting my camera I want to shoot nightlife so ...
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1answer
130 views

Canon camera DIY repair

I have a digital rebel XT, an 18-55mm, and 75-300mm lens, all by Canon. Everything has saltwater damage. I'm aware that it's cheaper to just replace it all, but I was fiddling around with it, testing ...
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1answer
545 views

Nikon AF-S Nikkor 70-300mm 1:4.5-5.6 G ED Lens will not autofocus

I have a Nikon AF-S Nikkor 70-300mm 1:4.5-5.6 G ED Lens that I purchased in Feb of 2013. I have been using this lens with my Nikon D3200. Up until this point my lens and camera have been completely ...
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1answer
408 views

Is there a way to make auto-focus more smooth while filming with Sony A55?

Wondering if anyone can help with this. I have a Sony SLT-A55, and when in video recording mode it is able to auto focus. My issue is that it does this "too quickly". For example, if I'm shooting ...
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0answers
35 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 ...
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0answers
37 views

Using motorized lense on a motorized Nikon body [duplicate]

Say I'm using a lens with an AF motor on a Nikon body which also have AF motor. Which one will be active? Is there a way to control it? Thanks
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0answers
107 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 ...
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1answer
65 views

Why would my Tamron lens auto focus stop working?

I purchased a Tamron 70-300 mm lens for my Nikon d5300 a few days back. Its autofocus worked perfectly. But now it doesn't work at all. I am a beginner and I don't know much about it. Why would it ...
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1answer
54 views

camera mobile phone takes pictures at constant focal length if 3.5 mm.supposed to have autofocus and touchfocus [duplicate]

This is a cheap Chinese landvo l200 Android mtk65xx mobile The onlything it keeps Changing is IS0 from 150 to 800 + And exposure time I wondered how can it autofocus and touch Focus when it keeps ...
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0answers
61 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
58 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
56 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 ...
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1answer
52 views

Trouble with Camera settings [duplicate]

My lens Nikon AF 85mm 1.8 will only focus at 22 otherwise I get a fEE flashing on the top display. Any suggestions? I use a D80.
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0answers
33 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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0answers
31 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 ...
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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 ...
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1answer
182 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, ...
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1answer
82 views

Will a shutter half-press perform an autofocus while shooting video on an EOS 650D?

Have Canon kept this feature or has it gone like the movie cropping mode?
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0answers
43 views

Budget Nikon setup - future problems due to AF-S vs AF? [duplicate]

Possible Duplicate: Is the lack of AF Motor on the Nikon D5100 an important factor? I am just starting up as an amateur photographer to venture into DSLRs. Being on a tight budget, I am ...
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0answers
346 views

Need help focusing at night with DSLR [duplicate]

Possible Duplicate: How to focus in complete darkness I have a Canon 20D, when I shoot outdoors at night I have a very hard time getting images in focus. I primarily shoot landscapes, so ...
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votes
3answers
360 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 ...
-1
votes
1answer
187 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 ...
-1
votes
2answers
8k views

Automatic autofocus on 600D/Rebel T3i during video mode [closed]

I was testing the video mode with my 600D, and I noticed autofocus was not working. I then enabled it via the menu and now you can focus when pressing the main button. I was wondering whether this is ...
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votes
3answers
719 views

Canon 70-200mm F4 L USM IS Focus Issues Photo All Soft?

Focus Issues Bought myself a used Canon 70-200mm F4 L USM IS Lens but as yet I've not achieved a single Sharp image list of various settings tried attempts so far and still no joy very frustrating. I ...