Photography

Questions tagged [back-focus]

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1answer
158 views

Is a Siemens star, printed with laser printer, suficiant for sharpness testing?

I have a Samsung SCX-4600 and I decided to make a Siemens star out of it using an A4 paper with vector to very high resolution PNG illustrations. Is it an decent choice? How will it compare to a ...
0
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2answers
74 views

No more turn left to get focus at infinity (hit the lens limit) [duplicate]

Academic question: If I run out of turn attempting to achieve an infinity focus (close, but no cigar) would I: Move the lens away from the sensor? OR Move the lens closer to the sensor?
2
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1answer
94 views

Back-focusing with Canon 7D2 body and Sigma 50mm art lens: is the Sigma USB dock the solution?

I just bought a second hand Sigma lens (50mm Art f/1.4) for my Canon 7D2 body (Mark II). This combination yields a very serious back-focus problem: With no micro-ajustements correction on my body, ...
1
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1answer
1k views

Can I calibrate a Nikon D7000 body at home?

Is it possible to calibrate a Nikon D7000 body at home so it doesn't back focus anymore? I did several tests compared to my brothers' identical equipment (body+lens) and concluded it is the body which ...
0
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1answer
1k views

D750 back button focus and remote

I have a Nikon D750 on which I have setup focusing to be on the AE-L/AF-L button (not on the standard shutter release button). Works fine. Now when using a remote (in my case the Pluto trigger), ...
0
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5answers
7k views

How can I fix back/front focus on my Canon 50mm F/1.8 STM lens?

I have a Canon EOS 1200D body with a bunch of lenses. A while back, I acquired the new Canon 50mm f/1.8 STM lens, and started noticing that the images were soft. After a bit of experimenting, I found ...
1
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2answers
3k views

Why does my D5200 autofocus behind the subject with my 35mm f/1.8G lens?

My Nikon D5200 works perfectly fine with two of my lenses, 18-140mm and 85mm. But it has an auto-focusing issue with 35 mm f/1.8G lens. The point where it seems to have focused is not as sharp. It ...
1
vote
1answer
136 views

Are any photographers known to intentionally make “creative” use of front/back focus settings of a camera?

A couple of weeks back I was testing my lenses for front/back focus, and an idea struck me: it's entirely possible to setup the camera to constantly back or front focus, so to permanently change the ...
1
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1answer
259 views

Front AF confirmation focus with manual lens?

Today I was testing my lenses for front focus/back focus (and while I was at it to test detail resolution at various aperture values), and found a really strange issue. From what I know, front/back ...
3
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1answer
354 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
3k 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 ...
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0answers
207 views

What would cause an AF confirmation light to go on and off as I approach correct focus?

I'm using two cameras: Canon EOS 400D (Digital Rebel XTi) and Canon EOS 450D (EOS Rebel XSi). 450D was more heavily used than 400D. Not so long ago I noticed that 450D's autofocus system works not ...
2
votes
3answers
494 views

When a lens and camera are callibrated together, which is changed, and might other lenses be adversely affected?

I wonder what exactly is the calibration of a camera body and a particular lens. I know the effect, but how it is achieved? I recently bought 80-200 (the two-ring version), I was waiting for too long ...
3
votes
1answer
914 views

Should back-focus be constant for all focus distances?

I have a problem: Back-focus of my lens is not constant so it is not possible to calibrate it using AF fine tuning. I have body Nikon D7000 and the lens is Nikkor 50mm f/1.8 D. I've bought the lens ...
4
votes
1answer
11k views

How can I fix my Nikon D7000's back focusing problem?

After using a new Nikon D7000 camera for awhile, I've found that that my camera has back- focusing issues - many images are out of focus, even portraits or focusing on near objects where I have ...
5
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1answer
2k views

Do all telephoto zoom lenses backfocus on the wide angle end?

I’ve just gone through a round of testing with two telephoto zooms, on two different cameras, and both appear to have significant back focus issues at the 70mm end. I just had the Nikon 70-200 f/2.8 ...
8
votes
1answer
677 views

How do repair shops fix focus shifts on bodies lacking focus microadjustment feature?

For camera bodies without autofocus microadjustment capability, how do repair shops calibrate a specific body and a lens combination suffering from the focus shifts (back and/or front focusing)?
4
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3answers
969 views

Does Nikon D7000 exhibit particular backfocusing problems?

I was considering buying a Nikon D7000 but I have found that (as of 2011) many reviewers were reporting back focusing issues. I would like to verify if these issues are real, and if they are still ...
4
votes
1answer
226 views

What factors influence whether a lens and camera combination front or back focus?

I know that sometimes a lens/body combo needs to be micro-adjusted to attain ideal focusing behavior, and that this is usually because of sample variation, but which parts of the lens and/or body are ...
2
votes
1answer
1k views

Problem with TTL autofocus on Canon 450d - is there a way to adjust?

I have Canon EOS 450D, and it seems, that camera have problem with autofocusing, when i'm looking through optical viewfinder. If I switch camera to liveview - autofocus works correctly, but slow. The ...
6
votes
1answer
256 views

Does backfocus/frontfocus change?

I have adjusted the back-/frontfocus setting in my camera for different lenses. Now I am wondering if I have to readjust the lenses regularly? Does the back-/frontfocus for a lens change much over ...
17
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2answers
26k views

What do “Frontfocus” and “Backfocus” mean? [duplicate]

I've read those terms in a couple of lens reviews, and not even Wikipedia has an article about it. So my questions are: What is back/frontfocus? What causes back/frontfocus? Is there any preventive ...
37
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4answers
93k views

What is back-focusing?

What is back-focusing? Is it something I need to be worried about, or can I just live with it? How can I tell if my camera/lens is sufferring from it?
11
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1answer
1k views

How can you tell if a lens is having problems with back focusing?

I recently bought a Canon EF 24-70/2.8L to use with my 450D and I suspect that it is constantly back focusing. Is there any way of determining if it is something wrong with the lens or if it is a ...
54
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5answers
23k views

What methods can be used to micro-adjust autofocus of 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 ...