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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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68 views

How do I prevent my camera/lens from focusing on only a subject? [duplicate]

I have a Canon 70D and am using a 50mm lens. I want to prevent it from focusing on a subject all the time. Instead, I want everything to be in focus like you get with a kit lens (18-135 etc.). I have ...
0
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0answers
56 views

Canon EOS 20D manual to autofocus lens adapter [closed]

I have a Canon EOS 20D with manual lens. I want to change to auto focus. Will a lens work with my camera? Will I need an adapter? Can I get a adapter to go with other lenses, i.e., Sigma, etc.? Lot of ...
3
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2answers
118 views

Which focus mode should I use for a portrait shoot?

I have to do a portrait shoot for a friend. My camera (Pentax K-30) allows me to focus in the following modes: 1 focus point (center) 11 auto focus points 5 auto focus points I haven't yet ...
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1answer
69 views

Can I achieve infinity focus from Auto focus? [duplicate]

I have a 18-55mm zoom lens with no Infinity symbol on it. Let's assume I want to capture stars in night. There are three ways to do it (If I am not wrong) Use Auto focus (If your camera is able to ...
7
votes
1answer
989 views

Why are photos taken with my old lenses all out of focus on my new Nikon D5300 body?

My Nikon D80 died, and I was bought a new D5300, body only. All the photographs are out of focus when I use the lenses I used with my D80. Why would this be? I'm using the Sigma 18-50 f/3.5-5.6 DC, ...
0
votes
1answer
32 views

How do I tell my T2i to use a particular spot for AF reference?

I just got a 50mm f/1.2 to go along with my T2i, but many of my photos are out of focus because the AF catches my subject's knee instead of her eyes, despite focusing on her eyes and recomposing. ...
2
votes
2answers
142 views

What's the advantage of many autofocus points rather than fewer spread wider across the field? [duplicate]

I have a D3200 with 11 focusing points: The newer and more expensive bodies have even more focus points like e.g. the D610: I mostly work in Single-point AF mode, which means I choose one of the ...
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4answers
84 views

Autofocus not working outside scene modes

I've just got my first DSLR (an old Canon 1000D) and I'm having problems with autofocus: When I'm in full auto or any scene mode (sport, portrait...) it works fine and I can make photos normally, but ...
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2answers
61 views

What technique can I use to focus on walking subject when in motion?

I have seen some photographers take photos while they are walking in a hallway or on street, etc.. where the setup is the person is walking towards the photographer, the photographer is backing ...
0
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1answer
96 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 ...
4
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0answers
46 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 ...
3
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3answers
131 views

Why is my camera focusing fine in liveview but getting it wrong with the viewfinder?

When I first got my Yongnuo 50mm f/1.8 it would not focus through the viewfinder. It will always miss (95% of times). Yet it worked fine in liveview. And now, recently, I started noticing the same ...
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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 ...
1
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1answer
53 views

Why is my Fuji X camera stuck in manual focus?

I have a Fujifilm X series camera with one of the nice prime lenses, and it seems to be stuck in manual focus mode. The switch on the camera is on S, and I flipped it back and forth several times, but ...
2
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1answer
88 views

Where is the AF-MF switch on a Tamron 70-300mm tele macro lens?

I am beginner. Recently bought a second hand Tamron 70-300mm tele-macro lens (model 572D) for nikon d5200. Its manual says it has AF-MF switch, but there is no switch I can see on it except ...
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2answers
97 views

Will more autofocus points improve hit rate for focus on the target I want?

I got a Canon 70D a couple weeks ago from Amazon. As explained here and many other places around the internet, its autofocus system doesn't work as one might think it does. The focus "point" actually ...
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2answers
101 views

Can I make my Canon 70D focus continously when viewing through the viewfinder?

I'm a newbie in photography, so don't judge me too much, just got the canon 70d and I noticed that when viewing through view finder while in P mode the camera would not focus automatically (I would ...
2
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2answers
192 views

Why are some portion of my landscape shots totally out of focus?

When shooting landscapes, a single image (say 1 of 200) is totally out-of-focus. A typical setup might be: focal distance = 7.1 (x 3.9) f-number: 5 exposure time: 1/800 According to ...
0
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0answers
114 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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1answer
118 views

AF-S vs STM focus noise and speed

I have an 18-55 IS STM and it focuses instantly almost and without even a single noise. Should I be concerned if a nikon 24-70 f2.8 (brand new) makes noise when focusing? Also, in bad light (night, ...
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2answers
447 views

Is the “One shot” mode more accurate than “AI servo” using back-button focus?

By using back-button focus you don't have to switch from "AI servo" when photographing stationary subjects. I tend to do this anyway since I have the feeling it's more accurate even when I can ...
1
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2answers
26 views

Does half pressing a RS-80N3 trigger autofocus if back-button AF is enabled?

I'm looking to invest in a remote trigger say the RS-80N3 or alike for my Canon DSLRs. I'm using them all with back-button AF enabled (and half press shutter autofocus disabled) and I wonder if half ...
2
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3answers
140 views

How to overcome auto-focusing problem in event photography?

The biggest issue for event photography I have noticed is camera not getting auto-focus at correct time. The moment you have to capture the camera is still focusing. If it would be landscape ...
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0answers
67 views

Nikon D5100 potential auto focus issue [duplicate]

I recently went on a trip and I've been noticing lately that my autofocus might be having issues. Some background info: I use a Nikon D5100 (past warranty) I shoot in RAW I mainly use a 50mm 1.4 ...
2
votes
1answer
77 views

Why do phase-detection focusing sensors not like linearly polarized light?

I learned that polarizers did not work with autofocus and we had to get new "CPL" filters, 27 years ago. I even understand how they work and the nature of the light produced, which was a lot more ...
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0answers
72 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. ...
1
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2answers
216 views

Nikon D600 has not enough power to drive AF 80-200/2.8

I gambled and bought Nikkor 80-200/2.8D from ebay (in good working condition) to use as portrait lens and for some slow-action shooting (not for sports) for less than 200USD. Of course, "Seller does ...
3
votes
1answer
292 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 ...
0
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1answer
65 views

Focus specifics in Samsung s5 [duplicate]

Can I take a photo with blurred background with Samsung s5 for a subject far by 2 metres of the lens? and what is the specific distance for manual focus for a 16 megapixel mobile phone lens to take a ...
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0answers
140 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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1answer
185 views

Can I enable back-button focus on a 3rd-party battery grip for my Nikon D610?

I have set up my camera to have back button focus. Does this not carry over to the battery grip or is there a way to set that up as well. I have a Nikon D610 but I have a third party grip (vello ...
0
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1answer
80 views

Canon EOS T2i 35-55 mm lens. Won't autofocus

Actually it WILL autofocus if I force adjust focus by hand beyond subject. It then adjusts itself to focus. If the lens is focused in front of the subject, it will not autofocus. Bad servo in the ...
0
votes
1answer
86 views

Can the Sigma 2x teleconverter be hacked so it will work with the Sigma 50-500mm?

Does the autofocus hack (where you mask off connectors on the teleconverter to make it misreport the aperture) work on sigma 2x teleconverter fitted on Sigma 50-500mm DG lens for Canon cameras?
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2answers
170 views

Can over-turning the focus ring break the lens?

I was trying to get low key shots in pretty dark conditions and had my Nikon D7000's 18-105mm VR kit lens in manual focus, to try to get the subject in focus in very low light. In the process, I kept ...
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1answer
171 views

Pictures start in focus then go out of focus?

I was recently shooting some surf after a session with my 7d and Tamron 18-270MM F/3.5-6.3 Di II VC PZD. I started shooting while he was in focus, then as he got to the main part of the maneuver the ...
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1answer
45 views

Camera body with autofocus [duplicate]

Can I buy a Nikon camera body that already has autofocus, then purchase any non-autofocus Nikon lens and be able autofocus simply from the body itself?
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4answers
408 views

Will any non-AF lens work on a Nikon camera with built in AF already in the camera body?

I want to purchase a camera with a built in autofocus motor, but I want to know if lenses without autofocus will then focus automatically on that camera body. In other words, can I buy a Nikon camera ...
0
votes
1answer
83 views

How do I prevent white box(es) (face detection) from showing up on my Canon EOS 60D?

I use a Canon EOS 60D to shoot a separate angle facing the audience at my Church. It works pretty well, except I have one huge issue. Whenever I point it to the audience, a bunch of white boxes start ...
2
votes
2answers
421 views

Canon 5D - Focus viewfinder indicators in Manual focus mode

On a Canon 5D MkIII, is there anyway to see the autofocus lock boxes on screen while manually focusing (showing the areas the camera detects as in focus)? This might just be an insane product of my ...
2
votes
1answer
72 views

5D Autofocus - disable tracking after lock?

I recently got a 5Dmk3 and it's been a really fun toy so far. I'm coming from a Canon 7D, so I'm trying to adjust to the much more complicated autofocus system. I've read the manual and looked around ...
4
votes
2answers
250 views

Why eye-controlled focus is gone?

I tried to google, but only semi-decent answer was that ECF didn't work for some and was a nightmare for support group. But are there any reasons modern Canons (or other major camera-makers) lack ...
1
vote
1answer
100 views

Why is my Nikon D5100's screen flickering while auto focusing under a streetlight in live view?

Tonight when I took a photo, I found that a horizontal line going upwards in live view while auto focusing. What would cause this?
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0answers
91 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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1answer
132 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)
0
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1answer
122 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?
1
vote
1answer
113 views

How can I unlock my manual focus ring?

The manual focus ring on my 18-200mm lens is totaly unmovable. I have tried attaching other lenses to my camera and they work, so I am thinking that there must be an issue with my lens. I have tried ...
2
votes
2answers
169 views

Why does my lens refocus when the f-stop is changed?

I have a prime Sigma f1.4 50mm lens on my Nikon D90 in P mode and focus mode on a set point of the field and notice that when I am using a tripod and change the f-stop that the camera changes the ...
0
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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
174 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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3answers
692 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 ...