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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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4answers
505 views

Autofocus performance of different brands at night

Are there huge differences in the ability to focus in low light between different brands and models? I have a Pentax Kx with a Sigma 30mm 1.4. My problem is, that the camera's autofocus does not work ...
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3answers
283 views

Why is micro 4/3 autofocus so much faster than DSLR live mode focus? [duplicate]

Both a DSLR in live view mode and a micro 4/3 system camera use the main sensor for autofocus. However, on a DSLR it's embarrassingly slow. This can't just be a software thing. How is it that one is ...
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2answers
928 views

Why can't AF-S lens (with broken auto-focus) work with bodies that have build-in motor?

Background: I have a Nikkor 70-300 AF-S G. Somehow, the VR and AF systems stopped working.. It was working perfectly fine, then for 2-3 months it stayed inside the bag, in a wardrobe, without even ...
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3answers
705 views

canon 6d or 5d II for macro?

At the mo I have a 550d and a 60d. my lenses are 17-35 2,8L, 24-80 2,8L, 70-200 2,8L, 100-400 4,5-5,4L sigma 150 2,8 and looking for the canon 50 1,2. The obvious next step is a FF Body. My main ...
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3answers
191 views

Why does my autofocus fail in windy conditions?

When I say windy, I mean inside 100+mph prop-wash, shooting from an open cockpit aircraft. The camera is an Olympus C-765 UltraZoom, which features a retracting zoom lens. It may be that manually ...
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2answers
173 views

How to focus manually with a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens?

I have a Nikon D3100, for which I just bought a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens. This is a CPU lens and works very nicely in auto-mode, i.e. when you let the camera set the focus. ...
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1answer
278 views

can i transform my manual focus lens into an autofocus lens?

I have a Nikon D3300 camera. And I bought a 55-300mm nikkor lens but this lens is not an autofocus lens, so when shooting I should manually focus and sometimes the photos are blurry. Is there any ...
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2answers
186 views

How does aperture/DOF affect continuous autofocus?

When the autofocus system is deciding to adjust the focus, say in a situation of the subject getting closer to or farther from the lens, does it take into consideration the current depth of field, ...
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1answer
14k views

Why isn't my Canon 70D autofocus accurate in manual zone AF mode with a 50mm f/1.8 lens?

I recently purchased a Canon 70D for its dual pixel autofocusing system and ISO performance. I am in love with this feature rich-camera; however I found the camera's autofocus fails to function ...
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2answers
2k views

Using old, manual focus lenses with a new Pentax DSLR

I have an old Pentax ME SUPER with three lenses, all of which have manual focus rings and no autofocus motors. Do new Pentax DSLRs have built-in focus motors that can deal with old lenses? FYI, ...
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1answer
366 views

What happens when a Sony SLT camera is operated with mirror up?

What happens if you attempt to operate a Sony SLT (pellicle mirror) camera with the mirror up? Does the camera detect this condition? Will the camera shoot? What happens to autofocus--can the ...
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1answer
110 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 ...
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1answer
164 views

DSLR body without auto focus + auto focus macro extension tube set + lens without having auto focus motor but focusing screw = auto focus?

I've Nikon D3000. It died not have auto focus motor boot in its body. I've a lens having no auto focus motor within it. I saw some auto focus macro lens extension tube. Does that have autofocus motor ...
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3answers
5k 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
4k views

Why are images with my Nikon D7000 and 70-200mm lens soft?

I'm having trouble getting sharp pictures with my D7000. I've tried it with a 70-200 and 18-70 and produce the same results. I've tried AF Fine Tune with one of those focus charts, but the value of 0 ...
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1answer
166 views

The future of AutoFocus [closed]

I bought a Nikon D5000. Back then I didn't know anything about photography, but it sounded like a really good intro camera. And so far it has been. I don't mind the DX format, and have invested in ...
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1answer
466 views

Which of the following lenses do fit on a Nikon D 3100

I've been given the following lenses from my neighbour; which ones will fit a Nikon D3100? Sigma 28-200 mm F F3,8 - 5,6 Nikon Af 70-210mm F/4,0-5,6 Nikon Af 28-85mm F/3,5-4.5 Nikon 50 mm F 1.4 Nikon ...
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1answer
472 views

Is continuous autofocus in video a software or hardware function?

My camera (Sony alpha A580) does not natively support video autofocusing. When I was buying camera, I didn't think that was such important feature for me. Now I want my camera to be able to autofocus ...
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1answer
41 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 ...
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1answer
156 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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2answers
1k 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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2answers
421 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, ...
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2answers
146 views

Autofocus icon is missing in Canon 650D, please help

Can anyone please help me in getting this icon back in my canon 650d
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1answer
365 views

Finding the distance of object from camera to the point of autofocus

Is it possible to find the distance to which the camera is auto focussing ? Camera auto focuses itself to view a particular plane in the real world in front of it. Is it possible to estimate the ...
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2answers
572 views

What might be causing my AF system to misfocus?

I have a Canon Rebel T1i with the default Canon lens. When I shoot with it, I use Auto Focus and get the red dot indicators in the viewfinder as expected. But even though it looks like the camera is ...
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1answer
10k views

How to troubleshoot a Nikon D5100 that will not autofocus at all?

A good friend of mine has a d5100, which was working perfectly fine yesterday. Today, however, it refuses to autofocus at all - it makes no effort to move the focusing ring etc. I have tried ...
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2answers
2k views

What kind of AF-motor does a Nikon D7000 body have?

I am a novice in the SLR photography world and am going to buy my first camera. I intend to take occasional videos. I guess if the AF-motor is screw and gear type, the clicking noise will ruin the ...
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2answers
235 views

What settings do I need for shooting a candid against the sky?

I have Canon 1000D. Most of the times I use canon 50MM F1.8. I use evaluative metering and single point (center) auto focus. What setting do I need to change to have metering of sky (say red of ...
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1answer
81 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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1answer
106 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 ...
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1answer
130 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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3answers
128 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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1answer
90 views

How can I confirm focus with a Nikkor 70-300 lens on a D3000?

Good day! I would like to have some suggestion from experienced photographers about following matter: I have a Nikon D3000 Camera. I bought a Nikkor Lens 70-300mm having not motor inside and unable ...
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4answers
1k views

Will the Canon 5D MK II with 100-400 1:4.5-5.6 work properly with Kenko 1.4 converter?

I'm using 5D MKII body and 100-400 f/4.5-5.6 lens. I want to use a 1.4 converter; will the Kenko converter work and autofocus properly?
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3answers
2k 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
223 views

Can I use a Cosina AF 28-300mm f/4-6.3 with a Nikon D5100 if I focus manually?

The Cosina AF 28-300mm is an autofocus zoom for Nikon F-mount (body must have AF motor). Can I still use it with the D5100, provide that I will have to manual focus?
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1answer
1k views

How to find out perfect autofocus adjustment value? [duplicate]

Possible Duplicate: What is the best way to micro-adjust a lens? I have D7000 for some time and all of my nikon lenses were working fine. But I have bought Tamron 28-75 recently and it's ...
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1answer
299 views

Skin tones become yellower/ oranger when flash is on

When I take pictures of people, the yellow and red tones seem to be enhanced and the result is a more jaundiced complexion in best case scenario and orange and a bit shiny if their skin is a bit oily. ...
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2answers
414 views

How to verify that Nikon SB-28DX AF-assist is working?

I have a Nikon SB-28DX which I am using with an F5. I understand from the instructions how to turn the AF-assist illuminator off. But, how do I verify that it's working? Does it still work with ...
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2answers
21 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 ...
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2answers
171 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 ...
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1answer
164 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 ...
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2answers
150 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
114 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
122 views

How to shoot moving subject with Panasonic FZ 70/72

I would like to know if I act right. Scenario: moving subject (animal, airplane or sport scene). I get my bridge camera, a Panasonic FZ 70/72. I focus (with autofocus) the subject pressing half ...
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1answer
413 views

What can I do about Pentax superzoom 18-270 autofocus problems?

I use a Pentax K200 and have been satisfied with the original Pentax 18-250 superzoom, for travelling, outdoors, family types of use. However the autofocus gradually failed, the motor going to and fro ...
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1answer
104 views

Why are OVF and Liveview focus dots in different locations in my Nikon D800?

I put my camera (D800) on a tripod to check for any focusing issues ,and if I switch from OVF to Liveview the focus dot is in a different location.I tried two different lenses and they both give the ...
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1answer
104 views

Tricking compact's camera autofocus

I'm trying to get some bokeh using a compact (almost premium) camera, a Nikon Coolpix p300 (although the question is general). Since the camera hasn't got a manual focus option, I'm trying to use the ...
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1answer
446 views

What is broken on my Canon 450D? Edit: Missing focusing screen and submirror: fixable?

I recently aquired a used Canon 450D, which the previous owner said was broken. I'm new to photography and SLRs so please excuse some of the ignorance following. After digging a bit around the last ...
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2answers
753 views

How can I repair a kit lens with a stuck auto/manual focus mode switch?

Recently got a Nikon D5100. After a few days I realized that I can't focus in manual mode. The auto-manual (A-M) switch on the lens seems to be the issue (I have to press the switch hard to manually ...