Spring 2012

Spring 2012
by ani

Submit your Photo
Hall of Fame

Please participate in Meta
and help us grow.

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

1
vote
0answers
73 views

Canon 6D Auto Focus Erratic Behavior

I have a 2 year old Canon 6D which I use primarily for landscape photography and taking shots of my grandkids. It exhibits a strange behavior at times when I lift it to my eye to compose a shot. ...
3
votes
1answer
118 views

How can AF adjustment be inconsistent across lenses?

How is it that sometimes a lens will work fine on a camera body without adjustment yet others need some AF micro adjustment tweaking. I would imagine that the accuracy of the AF system with regards to ...
0
votes
1answer
120 views

Canon 600D autofocus not working when using view finder but working fine with live view

My 600D's autofocus is not working at all when using view finder, when using it in live view mode the autofocus works just fine. I tried to google but could not find any concrete. Any advises? ...
1
vote
2answers
390 views

Does autofocus feature work on Nikon D5500 using the Tamron AF 70-300 F4-5.6 DI LD macro for Nikon?

I wanted to know if autofocus mode works on Nikon D5500 whilst using the Tamron AF 70-300mm F4-5.6 DI LD macro lens for Nikon?
25
votes
3answers
10k views

What is the advantage of the huge number of AF points?

If the camera has only 1 central AF point, it is difficult to focus on an off-center subject (without recomposing after autofocus) so having 3 AF points seems really useful. Similarly I understand the ...
4
votes
2answers
187 views

How can I more consistently focus on the point I want?

I've had so many wonderfully composed images turn out lousy because my AF isn't as accurate as I'd like (or I don't know how to wield it). Despite using single-point AF, my focus point is often ...
7
votes
3answers
3k views

Enable Auto focus after timer on Nikon D800?

I'll start with an apology if everyone knows this but me. I bought a Nikon D800 about a month ago (adore), but the wireless remote I used for the D7000 is not compatible. No worries, I'll just ...
0
votes
1answer
368 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 ...
3
votes
3answers
634 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 ...
0
votes
0answers
22 views

Is it possible to autofocus a Sigma 150-600mm when using a teleconverter? [duplicate]

I'm the owner of a Canon 70D with Sigma 150-600mm lens. I'm attempting to use this with the Sigma's TC-1401 teleconverter. However, I'm not able to use autofocus via the viewfinder, but only in live ...
0
votes
0answers
62 views

Using manual focus ring on AF lens

Help... I have a Nikon D800E with a 70-200mm F2.8 My question is this, if I have both my camera and lens set on AF ,why do I still have to use manual focus ring to get clear focus on my subject???
1
vote
1answer
69 views

What is the worst-case scenario if you move the focus ring in AF mode? [duplicate]

I have a EF-S 18-55mm 1:3.5-5.6 III, and want to know what is the worst-case scenario if you move the focus ring in AF mode?
1
vote
3answers
201 views

Does rotating the focus ring in AF mode cause any harm?

If I rotate focus ring in AF mode, does this hurt the camera or lens? My friend today rotated the ring 1/2 times before I saw him on Autofocus on my Canon 600d with lens: EF-S 18-55mm 1:3.5-5.6 III. ...
2
votes
1answer
63 views

Why do phone cameras focus and defocus deliberately while clicking a macro shot?

I've tried this with many phone cameras and almost all of them focused well for macros but only for a moment before they defocus to focus something further behind. If the camera can focus on objects ...
2
votes
2answers
813 views

Is it normal for autofocus to struggle when using a variable ND Filter?

I recently bought a Marumi variable ND filter and I've been testing it on my 24 - 105mm F4 and 70 - 200mm F2.8 Canon lenses. It seems that my lenses have a hard time focusing when the ND filter is ...
4
votes
3answers
5k views

What is a Dual pixel autofocus?

I have seen the term "Dual Pixel CMOS autofocus" used by Canon (specifically in relation to the 70D). What is it? Is this Canon specific technology? Are there equivalents in other manufacturer's ...
1
vote
1answer
941 views

What should I do if my Canon 24-105 f4 L is making focus-seeking noises but not focusing?

I have a Canon 24-105 f/4 L lens. Just today, it started having focusing problems. The problem does not manifest if the focus is easy: bright light and centre focus point is on a good contrasty ...
3
votes
3answers
2k views

Is focusing problems on Sigma lenses still a problem on a Canon body?

I am considering purchasing the Sigma 70-200mm f/2.8 EX DG HSM II Macro Lens. The problem is that many reviews point out that the lens has front focus problems, at least on a Canon mount. But those ...
2
votes
2answers
2k 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 ...
0
votes
1answer
1k views

Best AF Fine tuning for Nikon D7000 lenses [duplicate]

Over the last few months I've been noticing an annoying back - focus problem on my Nikon D7000, regardless if I was using a AF-S or AF lens. But the problem seems to happen more often on my 35mm 1.8G ...
7
votes
1answer
2k views

Which offers better results: FoCal or LensAlign Pro?

I am in need of microadjusting my autofocus for a couple of my lenses with my Canon 7D. Namely, I need to adjust the 100-400 L lens, which seems to consistently AF a bit softer than I've seen from ...
3
votes
2answers
244 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 ...
1
vote
1answer
107 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 ...
0
votes
2answers
125 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 ...
7
votes
1answer
1k 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
36 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
258 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 ...
0
votes
4answers
126 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 ...
0
votes
2answers
133 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 ...
3
votes
3answers
1k 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 ...
2
votes
2answers
257 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 ...
9
votes
5answers
9k views

What is the best auto-focus mode to use for bird photography?

Consider the image below: How would the shot be focused here? Using Auto-focus or manual? If there was a cluttered background, will auto focus detect the small bird and sharply focus on it?If manual ...
1
vote
1answer
245 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
votes
1answer
222 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 normal/...
-1
votes
2answers
172 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 ...
2
votes
2answers
212 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
votes
2answers
222 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 ...
4
votes
2answers
745 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 eye-...
0
votes
1answer
483 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, ...
1
vote
2answers
2k 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 ...
2
votes
2answers
74 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
200 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 ...
2
votes
1answer
133 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 ...
6
votes
3answers
8k 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 ...
5
votes
1answer
39k 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
431 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
votes
0answers
215 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
307 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
86 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
378 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 ...