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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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1answer
57 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 ...
-1
votes
2answers
67 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 ...
1
vote
1answer
141 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 ...
2
votes
2answers
156 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 ...
6
votes
3answers
2k views

What causes auto-focus “freezing”?

On occasion, the auto-focus system in my camera and/or lens just stops working. I'll be holding down the shutter release halfway and tracking a subject and I can feel/hear the auto-focus system ...
1
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2answers
416 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
2answers
67 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
votes
1answer
137 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 ...
4
votes
2answers
232 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 ...
3
votes
3answers
518 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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0answers
76 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
votes
1answer
72 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, ...
0
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2answers
176 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
vote
2answers
18 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
votes
3answers
129 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 ...
0
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0answers
58 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
63 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 ...
5
votes
3answers
2k 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 ...
0
votes
3answers
300 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 ...
3
votes
1answer
4k 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 ...
4
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1answer
18k views

Which Nikon DSLRs have an autofocus motor in camera body? [closed]

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 ...
1
vote
2answers
139 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 ...
0
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0answers
51 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. ...
3
votes
1answer
284 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
votes
1answer
59 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 ...
2
votes
2answers
211 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 ...
0
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0answers
96 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?
0
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1answer
74 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
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1answer
111 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?
8
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5answers
584 views

How to precisely focus in self-portraiture with very wide aperture?

I've been trying to take some self-portraits, but I often have to struggle with the auto/manual focus. I don't miss by a lot, but I really want sharp focus in the eyes. I'm using a 50mm/1.8 around ...
0
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1answer
73 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?
9
votes
2answers
6k views

How to enable Canon AF with teleconverter?

Canon DSLR bodies prevent poor auto-focus performance by disabling it completely when the lens reports maximum aperture at chosen focal length smaller than f/5.6. This implies that some lenses will ...
1
vote
2answers
138 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 ...
1
vote
1answer
146 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 ...
2
votes
1answer
151 views

Nikon 300mm autofocus makes noise and stops working temporarily

I have a Nikon D5100 and a used Nikkor 300mm AF-S f/2.8D IF-ED II, where the two usually work great together. However, if I use autofocus a few times in a row (usually when the change in focus ...
3
votes
4answers
265 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
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?
0
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1answer
61 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
205 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
65 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 ...
1
vote
1answer
66 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?
48
votes
4answers
17k views

What is the best way to micro-adjust a camera body to a particular lens?

I have a Canon 7D with a 50mm f/1.4 lens, and I think the auto-focus of the lens is off. How can I test and adjust this reliably? Will this approach work with all of my lenses? If I had a different ...
0
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0answers
83 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 ...
5
votes
3answers
469 views

Do I need a better Camera or do I need to learn how to use the one I have?

Read some of the old questions. I figure that due to my wants you may be able to help me. Let me be clear about what I am doing, what I want to do, and see where we can go from there. I help run ...
0
votes
1answer
113 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)
1
vote
1answer
105 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 ...
26
votes
6answers
5k views

Can I damage the focus system by turning the focus ring when the lens isn't mounted?

I have a couple lenses that don't have an internal focusing system, and whenever I want to put them back in my bag, I turn the focus ring to make the lens shorter. I noticed that when the lens is set ...
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
7
votes
1answer
26k views

What is the difference between AI Focus and AI Servo autofocus modes?

Recently I bought a Canon 60D and I am uncertain about when and how to use/activate the AI Focus and AI Servo functions. I understand the One Shot autofocus function for still subjects. You press ...
0
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0answers
152 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 ...