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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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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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3answers
1k views

How to achieve auto focusing with a non-TTL flash (YN-560 II) in low light situation?

I recently bought a new YN-560 II hotshoe flash but found that it has neither TTL nor assist beam for focusing in low light situations. The problem now is that I'm starting my career as a night ...
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1answer
56 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 ...
8
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1answer
420 views

How does autofocus deal with the time to change aperture and raise mirror?

This picture turned out really well: and here Lila is running towards the camera, and the aperture is wide open. I know the AF system uses the phase of light and diffraction to work out when it is ...
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3answers
3k views

How do I keep my Nikon D5100 from attempting to autofocus with every shutter press?

I have a Nikon D5100 and the auto focus works fairly well most of the time. But there are times when I have a subject in focus and want to fire off multiple shots fairly quickly. I do not need to ...
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0answers
31 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 ...
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2answers
5k views

Why does Nikon D3100 locks Shutter in Autofocus mode?

So I just got this Nikon D3100 Camera. And I am trying to take a picture using autofocus with the kit lens(18-55mm). The system is in Auto mode, AF-A, single frame and the lens A-M switch is on ...
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1answer
82 views

Where do we focus when shooting cars in a street?

f I just want to put the camera at night at the corner of a street to get long exposure effect of the cars that are moving for their car lights, What is the focus settings I should use? Should I also ...
3
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2answers
247 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
105 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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4answers
1k views

Shooting full manual during an event or function

I have been shooting quite a bit of events lately. I do pre-shoot prep on my camera gear and check out the venue ahead of time to evaluate the setting and how the event will run plus light quality to ...
3
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3answers
408 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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2answers
111 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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2answers
124 views

Can changing metering mode change focus?

I've Canon 600D and I use the back button to focus and the shutter to meter, I've been using spot metering for over 2 years for now and I understand what's the difference between it and evaluative, I ...
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0answers
49 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 ...
3
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2answers
103 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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5answers
6k views

Why my “action” shots are blurry even shooting on AF-C, is this a lens or camera limitation?

I'm currently using a Nikon 28-200mm AF-D with my D7000. While trying to take action shots (e.g. my dog running or sports) none of the shots seem to be in focus even on AF-C mode. Would this be a ...
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5answers
5k 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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3answers
310 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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1answer
93 views

What to do about autofocus problems on a brand new SLR?

I'm having an autofocus problem with my new D5300: I've tested with both the 18-55 kit lens and the 50mm 1.8 AF-S, but it won't always autofocus. I have tested in good light conditions, with different ...
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30 views

Focus Effect for Canon Powershot SX520 [duplicate]

How can I achieve a focus effect for Canon Powershot SX520? Something like this: Thanks!
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2answers
526 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
14k 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
152 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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0answers
57 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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1answer
63 views

Why does AF assist light only work with center focus?

Last night I had some problems with the AF assist light of my D80 that made me miss some pictures. I thought it would be defective, although I was able to use it the previous time. Looking for the ...
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2answers
354 views

DSLR in AF mode. Do we need to use Focus ring on lens?

My camera is in Auto Focus mode (AF). As my understanding, the camera will focus on subject automatically. But when I rotate the focus ring, the focus subject points will change, too. I don't ...
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1answer
3k 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
810 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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2answers
15k 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 ...
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3answers
89 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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1answer
56 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
83 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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1answer
177 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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4answers
46k views

What is back-focusing?

What is back-focusing? Is it something I need to be worried about, or can I just live with it? How can I tell if my camera/lens is sufferring from it?
5
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1answer
139 views

Converting cameras for infrared use: When does the filter have to be replaced, and when is simply removing it ok?

When converting a digital camera for infrared use, the general approach is to remove any filters that limit its sensitivity to the visible range of light wavelengths. Some conversions replace the ...
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3answers
182 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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2answers
414 views

Lens for my Nikon D3200 dSLR is giving too much blur [closed]

I have a lens I purchased from an older film Nikon. Fits great on my Nikon D3200 but I cannot seem to figure out how to make the picture less blurry.... I have changed aperture, I have adjusted ...
3
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3answers
960 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
101 views

What settings should I use to take a burst at the highest possible FPS?

My goals is to take a burst of photos at the highest possible FPS. What settings should I use, other than the ones below? Save as JPEG standard, rather than fine, RAW or RAW + JPEG. Using the speed ...
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0answers
52 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
114 views

What are the pros and cons of setting my camera to lock exposure on half press? [duplicate]

The Sony NEX-5R has an "AEL w/ shutter" option that Sets whether or not to fix the exposure when you press the shutter button halfway down (On/Off) (from the manual) What are the pros and ...
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1answer
51 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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2answers
134 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 ...
8
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2answers
2k 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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3answers
105 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
266 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
121 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
3k 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
279 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, ...