The back-focus tag has no wiki summary.
4
votes
1answer
150 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
179 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
votes
3answers
540 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 ...
3
votes
1answer
98 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
317 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
190 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 ...
13
votes
1answer
6k views
What do “Frontfocus” and “Backfocus” mean?
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 ...
24
votes
4answers
22k 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
votes
1answer
715 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 ...
43
votes
4answers
9k views
What is the best way to micro-adjust a 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 ...
