Questions tagged [autofocus]

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
51 views

Fuji 35mm 1.4 stuck in manual focus mode?

I know that to go into autofocus mode the lens ring needs to be pulled out. However mine is completely stuck! I am a member of the Fuji VIP program and have received a faulty lens before. I got ...
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2answers
863 views

Why won't a Tamron AF LD 200-400mm f5.6 model 75DN autofocus on Nikon D3300? [closed]

Can anyone tell me how to work the autofocus on a Tamron AF LD 200-400mm f5.6 model 75DN? I have tried numerous settings on the f-stop ring with no success and there is no auto/manual switch. It will ...
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1answer
103 views

What could cause the focus to be off in some images and not others?

I took a number of photos like the one here. Each was at the same settings but each time I asked the camera to focus (with a single focus point) and the focus point right on the girls face. The ...
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2answers
131 views

Canon T7i focus indicator misbehaving [duplicate]

On my Canon T7i, in the viewfinder, there is a circle that shows up when focus has been achieved. That is not functioning correctly now. I am using it with a 24mm f2.8 Canon lens. The focus ...
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87 views

Nikon D-750 autofocus not working

The autofocus doesn't work on my 2 year old Nikon D-750. Doesn't work with any of my lenses. The AF is set on both the camera body and lens.
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1answer
167 views

EOS 5D Mark III for photo and video in 2020 [closed]

Is the 5D Mark III a good DSLR for both photography and videography in 2020? Does it support features such as tracking or continuous AF in video mode? I did some research but I didn't find a clear ...
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1answer
141 views

How big is an AF-Point in a Nikon camera?

I have a Nikon D7500 and am looking for information regarding the size, in pixels, of each individual AF-Point in the 51-point AF system. When stored in NEF files, Nikon references their AF-points in ...
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3answers
116 views

Remote flashlight device for focusing in an off-camera flash scenario

I was shooting in a fairly dark room with two Yongnuo YN560 IV off camera in softboxes and a Yongnuo YN560-TX II on the camera to trigger them. I was not able to focus without having someone hold a ...
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4answers
207 views

Should I use automatic focus or manual focus for bird photography?

I have a Canon Rebel XTi and some decent lenses. I am considering getting a 500-1000mm f/8 telephoto zoom lens. For photographing birds that are 25-100m away, should I use an automatic focus or a ...
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3answers
156 views

Does the autofocus system look through the lenses?

I have a doubt about the effect of putting a filter (polarizer, UV etc) on the autofocus system. In theory, a lens which is put in front of the lens will affect the focus (we must set a different ...
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1answer
170 views

Confused about AF, AF-S (Nikon Autofocus)

I have a Nikon D610. I thought it would work with AF lenses, but my Nikkor AF 50 mm 1.8 D doesn't autofocus, Same for the Yongnuo 50 mm 1.8 AF (the Yongnuo has a MF/AF switch on the lens). Are these ...
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2answers
295 views

Why doesn't lens focus after turning focusing ring while set to autofocus?

My brother tried my new camera and was turning the focusing ring quite harshly on auto focus. (50mm canon lens) I’ve read multiple similar questions but nothing is quite what I mean. Ever since my ...
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Are electronically parfocal RF lenses parfocal enough for fireworks photography with zoom?

Within a month or so, it's the first time I'll see fireworks as an owner of a good camera and naturally I'm planning to take photographs of them. By researching various fireworks photography sources, ...
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132 views

Is there any test data available that characterizes performance of Canon's “AI Servo AutoFocus”?

After trying numerous recommendations for setting Canon's AI Servo AF, I am getting only the rare in-focus picture of small birds in flight in their native environment. Based on this I have formed an ...
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AF Fine-tune zoom lenses?

How do you fix / fine-tune the focus on a zoom lens? Nikon states The D850 can fine-tune autofocus automatically. The results can be used with all lenses of the same type. But does it also mean ...
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2answers
170 views

AI Servo does not support Live View mode for Canon 1DX Mk ii

I've been doing some experiments with my AI Servo Autofocus system in my 1DX Mk ii. Basically, the experiments were intended to help me understand some of the rather confusing jargon used to describe ...
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2answers
291 views

Nikon D5200 no longer focuses

It used to be that on my Nikon D5200 camera holding down the shoot button halfway the viewfinder would show green dots and it would focus nicely. Now after resetting the camera settings, replacing ...
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4answers
132 views

Is it possible to use a follow focus to add AF to MF lenses?

I recently switched from a EOS 7D to a Sony a6400 and since I have to buy new lenses I saw the huge difference in price between compatible AF and manual focus lenses. I also stumbled upon this: ...
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6answers
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Why aren't faces sharp in my f/1.8 portraits even though I'm carefully using center-point autofocus?

I love my Canon Rebel T6 and take portrait pictures in Av mode with a 50mm in 1.8 Av. I'm using auto focus in the 'focus on center point' mode. I make sure that the center point focuses on the face so ...
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2answers
115 views

How can a subject stay in focus if the shot is recomposed afterwards?

I have a doubt about a procedure that I see many photographers continuously apply and they taught me. I see that, when they want to take a picture with their reflex, they do this sequence of steps: 1)...
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2answers
141 views

What lenses for a Nikon camera have both an AF motor and an aperture ring?

I have a Nikon FE10 35mm film SLR and a D5600 DSLR. I want a wide focal length prime or mid range zoom (nothing longer than 120mm) to use on both cameras. I need an aperture ring for the film SLR ...
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1answer
34 views

How to set AF area mode viewfinder if values are gray (can't be chosen) on Nikon D3500?

When setting AF area mode viewfinder on my D3500, I can only chose 2 options out of 4: single-point AF and auro-area AF. The remaining two: dynamic area AF and 3D-tracking are gray and the camera says ...
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2answers
138 views

What should I do when the results from Reikan FoCal show flaws?

I've done an AFMA calibration Reikan Software. Assuming this was properly executed, do I need to take the results seriously? All my lenses do suffer from astigmatism, and also my new Canon 24-70 f2.8 ...
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4answers
561 views

How do fixed lenses “focus” on things at different distances? [duplicate]

I'm trying to understand depth of field and I'm struggling. If I'm playing with a 50mm fixed lens, and I alter its focus using the little ring around the lens, what is actually changing in terms of ...
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1answer
119 views

Canon 50 1.8 STM: AF adjustment not possible?

My 50 1.8 STM back-focuses a little when focused through OVF. I visited Canon Service in Bangalore today. The technician there outright told me that there is no adjustment possible for 50mm 1.8 stm ...
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1answer
57 views

Could someone share AF calibration settings for Sigma 18-35mm lens on Nikon D3300?

I have auto focus problems with Sigma 18-35 which I recently bought on D3300. I would like to see other's AF adjustment/calibration settings. I am having a hard time with setting it up. Are the ...
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1answer
330 views

Focusing issues on live view - Nikon D750 w/ AF-S NIKKOR 24-70mm f/2.8G ED

On a heavily used Nikon D750 w/ AF-S NIKKOR 24-70mm f/2.8G ED: When using live vision, ussualy while holding the camera up over my head, autofocus focuses nowhere. This happens right after having ...
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2answers
146 views

Focussing area is different in live view than when viewed in viewfinder

When I use the AF-S mode or any other mode through the view finder, I can see an area in which the focus point can be moved. It is relatively small. What if I want to focus out of that area or focus ...
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3answers
84 views

What should I do when autofocus is not working after i dropped my camera? [closed]

Yesterday i had dropped my camera and everything is working except Auto focus while using view finder but on LCD it is working fine and pictures are coming good. All is good except Auto focus, I ...
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1answer
60 views

Nikon D5100 struggling to autofocus on screen, but fine through viewfinder? [duplicate]

hope you can help me and my frustrating issue I have a D5100 with a Sigma 18-250mm f/3.5-6.3 dc os lens which will AF no problem at all when I'm looking through the viewfinder but when I change to ...
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2answers
113 views

When using Back Button Auto Focus, do I release the button before shooting a sequence, or hold it down?

When shooting moving subjects (Sports), am I suppose to keep the back button AF pressed during a sequence of shots? Or do I press til it focuses, and then let go and shoot a sequence? Thank you in ...
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1answer
52 views

Question on f-number and exposure [duplicate]

Is there any mathematical proof to show that the exposure in a camera is independent of the focal length used, if the f-number (ratio of focal length to lens diameter) remains constant?
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2answers
112 views

Relationship between f-number and amount of light being let into the lens system [duplicate]

Why does smaller f-number imply greater aperture diameter and consequently, greater amount of light entering the lens of a camera? As evidenced from my study across a number of resources, an absolute ...
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1answer
147 views

Does EOS RP support recomposing with servo AF?

My EOS RP has two AF modes: one shot AF and servo AF. With one shot AF, the camera focuses once and allows recomposing the picture. With servo AF, the camera keeps looking at the selected AF point, ...
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1answer
78 views

Auto-focus in Nikon D3100 doesn't work and i can't take pictures

When on autofocus my camera will not focus. The lens will do the twisting movement, go in and out of focus and then stay out of focus. Then it won't even take a photo. In addition, when on manual ...
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1answer
2k views

Why do even high-end cameras often still include normal (non-cross-type) AF sensors?

Modern cameras often use two kinds of AF sensor: normal, and cross-type. While normal-type AF sensors notably struggle focusing on high-contrast vertical lines, cross-type sensors, though more ...
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3answers
313 views

Why don't any cameras use time-of-flight systems (like ZCam) for autofocus (and allow extra raw creativity with z-data)?

After reading Why don't DSLRs use laser rangefinders for autofocus? This question come in my head : Why camera don't use z-cam for autofocus (and allow extra raw creativity with z-data) There is ...
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1answer
143 views

Canon Rebel T6 won't autofocus after taking photo

I'm trying to repair a Rebel T6 with a strange problem. All settings are stock, AF One Shot, center point selection. I've tested with 3 lenses including the 18-55 kit lens. After turning the camera ...
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2answers
81 views

Focus motor problem in lens due to fine dust particles

I have a Sigma 18-250mm F3.5-6.3 DC Macro OS lens that I use exclusively with my Nikon D5300. I went to Denmark last year, and visited Rubjerg Knude Lighthouse. If you've ever been there, you know ...
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1answer
447 views

Why won't the autofocus on my Nikon 200–500mm ƒ/5.6E work?

I can't seem to get the autofocus on my brand new Nikon 200–500mm ƒ/5.6E lens to work. All the settings (on the lens and camera, including AF switches) are set to autofocus. Trying other lenses on ...
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1answer
48 views

Autofocus glitches in Nikon menu for Sigma 18-50 f2.8-4.5 lens

I have sold a Sigma 18-50 f2.8-4.5 OS HSM to an internet buyer. The lens worked fine, but after receiving it today, he said that whenever he turns on autofocus on the lens the camera has a glitch in ...
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2answers
354 views

Can I get this nikon d750 repaired or replaced?

I searched for answers on why my autofocus stopped working for my Nikon D750. I found that someone posted: “Note that when using AF lenses that are not AF-S lenses the AF/M switch on the camera ...
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1answer
60 views

Nikon Ch and AF-S mode - what controls whether the camera will try or not try to refocus during series?

Experimentally, on a D200 that was at hand, set to CH (continuous-high) drive mode, AF-S (autofocus-single), release priority, center focus point only, tracking:Normal (should not affect AF-S?) there ...
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1answer
769 views

Canon 50mm 1.8 lens not autofocusing on *one* camera

I have a Canon EF 50mm f/1.8 STM lens than when attached to my 100d doesn't autofocus. I presumed the motor had gone on the lens, as it had previously worked fine A friend has recently let me ...
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3answers
86 views

Are focus-peaking MF and contrast-based AF susceptible to being misled by metallic reflections?

Wondering about some shots that went wrong, which were shot with focus peaking and manual focus, and where there were metallic/mirror-reflective highlights (think scenes with crumpled car wrecks or ...
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3answers
208 views

How does autofocus micro adjustment (AFMA) really work?

One of my answers was edited to include autofocus micro adjustment (AFMA) as a camera choosing criterion. The edit linked to another answer explaining the AFMA more. My understanding of autofocus is ...
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1answer
99 views

Which camera (and lens) mode or settings for moving subjects?

So for the first time, I've been shooting moving subjects. I've got a new camera and a lot of stress, so I barely had time to set it up completely before the shoot (nothing professional though anyway)....
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2answers
346 views

Is it normal for EF 24-105/4L IS to autofocus when switched to manual focus?

I'm using a Canon 6D mark II. I recently got a Canon EF 24-105mm f/4L. I wanted to try using manual focus, so I switched the lens to manual focus, but it keeps auto focusing when I half press shutter ...
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1answer
884 views

Canon EOS 60D will not focus accurately [duplicate]

I have an EOS 60D that has had intermittent focusing issues since a purchased it. I primarily use the Canon 28-135mm f/3.5-5.6 IS kit lens. I also have a new Canon 70-300mm f/4-5.6 IS USM and a ...
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1answer
157 views

Does near infrared AF assist light work with sensor based autofocus?

Some flashes, cameras and wireless flash triggers (like Canon ST-E2) have a near infrared AF assist light that is invisible to the human eye. My understanding is that his AF assist light works at ...

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