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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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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138 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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53 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
30 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
71 views

Why won't the autofocus on my Nikon 200-500 work?

I can't seem to get the autofocus on my brand new Nikon 200-500 f/5.6E lens to work. All the settings (on the camera and lens) are set to autofocus. Trying other lenses on the camera, the autofocus ...
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1answer
30 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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89 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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27 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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216 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
66 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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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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84 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
104 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
191 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
52 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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87 views

What to do with a Nikon D750 body that when switching lenses won't autofocus?

There was another similar question out there and one of the responders commented there was and he got his camera body replaced. I've been having the same issue with my new nikon just bought in January....
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1answer
74 views

How does a DSLR measure brightness and sharpness of an image?

In mirrorless cameras, light reaches the image sensor all the time, so this data can be used by the camera to determine the correct focus, shutter time, aperture and ISO. Makes sense so far. However ...
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3answers
112 views

Is it normal to see focus inconsistency frame-to-frame with an f/1.4 lens?

I have the Nikon Sigma 85mm 1.4 and I've noticed some inconsistency with focus. I setup a tripod, and a lens calibration card in an attempt to micro adjust the focus. However, what I noticed was that ...
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1answer
59 views

How to change auto-focus point in Auto mode on Fujifilm X-T20?

When I set my Fujifilm to AUTO mode, the focus points area seem to be only at the center of the screen. Is there a way to make this to cover the whole area? So that if my subject is at the edges, it ...
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3answers
458 views

What is “focus distance lower/upper” and how is it different from depth of field?

I have taken two photographs on a Canon crop sensor camera: 18mm f/9 with the following exiftool output (the focus was approximately at 3.5 meters): Focus Distance Upper : 5.27 m Focus ...
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2answers
52 views

Are the autofocus parameters independent from the selected case?

The behavior of Canon's AI Servo AF autofocus can be modified by choosing one of six presets, and can be customized further by adjusting the Tracking sensitivity, Acceleration/deceleration tracking ...
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1answer
41 views

650D and AF chip

Recently bought a PK-EOS ring adaptor for my older Pentax K lenses. Went with one that has an AF confirm chip. Chip causes "Communications error" and locks all camera functions. I've discovered that ...
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3answers
820 views

How sharp are RAW photos before processing?

Are RAW images by nature slightly blurry prior to processing? If I open them up in Lightroom and zoom into the photo, my photos are not tack sharp but a bit blurry. Once I process, it comes out ...
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1answer
140 views

Best settings to focus in low light and low contrast condition

I have been shooting for several years in the north of Canada and I notice that I don't get a really high percentage of keeper when using my Canon 100-400 Mk II or 70-200 F2.8 Mk II with either 5DIV ...
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1answer
350 views

Nikon D750 Lens Mounting Issue

I bought a Nikon D750 during the 2017 Black Friday and the camera is just out of manufacturer warranty. I am having a weird issue with my Nikon D750. With the original 24-120mm Nikkor lens, I am ...
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1answer
70 views

Does EOS utility fully work with other (non canon) lenses?

I only used canon lenses with EOS Utility before and now I'm looking to buy a new sigma lens. My question is: would fine focus adjustments when shooting tethered still work with other lenses? Edit: ...
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2answers
116 views

Will a faster lens help getting a better (faster/more accurate) focus? [duplicate]

I read that with some cameras (but which?), using an f/2.8 lens or faster enables a more sensitive phase AF point, so there is quantum jump in AF accuracy. But that's not really my question :) My ...
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2answers
264 views

Why are Nikon Cameras not widely used to shoot video as compared to Canon/Sony? [closed]

I am new to the photography, and I use a Nikon D3400 and 18-55 VR kit lens for casual photography and once in a while I shoot video in 1080 60p. But everywhere in youtube I see people saying that ...
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3answers
319 views

Why is my Canon 70D's liveview autofocus much worse than the viewfinder's?

First of all I came across these questions already: My viewfinder won't autofocus but live view focuses well Canon 600D Autofocus not working when using view finder but working in live-view Why is my ...
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1answer
81 views

AF tune first time help

I've purchased a second hand Nikon D810 and have recently started discovering a few focus problems. Since i shoot alot of theatre and things get printed big quite alot, having things with precise ...
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1answer
115 views

How do i return my nikon d3100 back to auto focussing with the shutter?

I tried back button focussing with my nikon d3100 by going to the button section of the setup menu and pressing ok for the AF-ON button. I now want to return to autofoccusing with the shutter but don'...
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1answer
170 views

Autofocus issue in liveview for Tamron 70-300mm

I have been facing autofocus issue with Tamron 70-300mm VC USM lens on Nikon D5300. The camera autofocuses fine through viewfinder but it is not able to autofocus at all in liveview, the lens just ...
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1answer
132 views

Which mirrorless configuration would be faster in low light (ISO 3200)?

I shoot indoor sports (arena) and I am planning to buy new mirrorless equipment. My typical shooting parameters are 1/250sec, 200mm, F4, ISO 3200 using an entry-level APS-C DSLR. AF (speed and ...
2
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1answer
237 views

Why does my superzoom lens sometimes miss focus?

I've got a Nikon D7500 with the AF-S DX 18-300mm zoom, a combination I love. I do a lot of outdoor photography and find myself switching between wide angle and telephoto repeatedly as different shots ...
3
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2answers
260 views

Are there autofocus-enabled adapters for Olympus lenses on Canon EOS cameras?

Fairly new to photography so forgive my foolishness before calling me out, I already know. I bought a Olympus 50mm F1.8 lens thinking it was a manual focus but when I received it I realized I misread ...
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2answers
394 views

Focused properly and microadjusted lens give blurry image on Canon 80D and quite fine detail on 350D

I'm an unhappy owner of brand new Canon 80D. I still have 350D which served me for nearly a decade. I use the same 24-105 1:4 L IS lens with both of them. It turned out that lens is blurry. I've ...
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2answers
216 views

Why are subject's eyes out of focus with EF 28-70mm F2.8 L?

I purchased an older 28-70mm F2.8 L Series lens. I'm trying to use it to take portraits on a Canon 5D Mark III. However, when I use autofocus at 70mm, the eyes are not in focus and the face seems ...
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1answer
343 views

Can I adjust the autofocusing of my Canon 6D Mk II myself?

So I took my 6D II into CPS for service. It was front focusing pretty hard and I couldn't get it micro adjusted. Canon sent an invoice stating exactly "focus points are off, unit is front focusing, ...
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2answers
153 views

Why does my lens only autofocus when I have a teleconverter attached?

My Nikon 500mm f/4 AF-S D IF II lens won't auto focus on a Nikon D500 until I attach a Kenko 1.4x teleconverter — then it autofocuses fine. Does anyone know what's going on?
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2answers
395 views

Does on-sensor phase detection autofocus need adjustment for accuracy?

Is autofocus adjustment actually no longer required with on-imaging-sensor autofocus that's phase-detection only i.e. not relying on contrast detection? If not, why? How does lens autofocus adjustment ...
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3answers
148 views

What equipment would be best for a new photographer, interested in macro nature photography?

I recently started a photography class and I really like it, and I want to start taking photos outside of school with my own camera but I don’t know what to get. I love taking close up pictures of ...
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1answer
213 views

Can Magic Lantern provide missing Autofocus Microadjustment (AFMA)?

I want to upgrade my Canon DSLR to either a 50D or 550D. The only thing that I find really lacking in the 550D is autofocus microadjustment (AFMA), but there is free Magic Lantern software, which I do ...
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2answers
947 views

Can Magic Lantern provide AFMA on an EOS 77D?

I want to upgrade my Canon DSLR to either an 80D or 77D. The only thing that I find really lacking in the 77D is AFMA, but there is free Magic Lantern software. Can I safely assume, in practical terms,...
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1answer
53 views

Auto Focus Lamp: Nikon

I don't know what happened but my AF lamp doesn't work any more. The bulb is not burnt out because it flickers when \i tested it with the 10 second timer. The problem comes when I'm trying to find ...
3
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1answer
914 views

How to set “release priority” rather than “focus priority” on Canon DSLR?

FujiFilm X-Series cameras can be set for focus priority or release priority. This controls the camera behavior when AF cannot lock. On focus priority, the shutter will not release. On release priority,...
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2answers
116 views

How to accurately determine the size of a nearby object (~15cm) using the autofocus focus distance?

The problem I'm trying to determine the size of an object using the focus distance determined by the autofocus of a smartphone camera (Galaxy Note 8). But I don't seem to be able to get an accurate ...
3
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1answer
106 views

Nikon only allows single photo in auto mode or if flash is used

Basically what is happening is if I start my Nikon D5300 in AUTO and take a picture it will only allow me to take that one picture and not allow me to take another picture at all. The autofocus stops ...
5
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1answer
214 views

How to prevent autofocus but retain tethered focus control?

I'm using Darktable (on Linux) with Canon 1100D in tethered shooting mode. I found out that from live view section I can control focus in big or small steps. This all works nicely, and I can see the ...
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1answer
151 views

How to diagnose old Canon EF 35-105mm lens with autofocus motor too weak to reliably rotate lens barrel?

I bought a couple of old Canon EF lenses and they are very slow at autofocusing on my 350D. The worst offender is the EF 35-105mm f/4.5-5.6 USM. This lens regularly gives up moving the barrel after a ...
2
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1answer
134 views

Does time lapse of the sun damage the auto-focus sensors or components of a DSLR?

This question is not about the main imaging sensor, but about the autofocus sensors and circuits on a DSLR. I read that sunlight may damage the shutter or the main sensor. But when using the DSLR, ...