Questions tagged [front-focus]

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54
votes
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 ...
0
votes
0answers
205 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 ...
1
vote
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 ...
1
vote
1answer
257 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 ...
16
votes
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 ...
3
votes
1answer
349 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
2answers
1k views

Does this test chart show that my kit lens front focused?

I just bought me a Nikon D7100 with 18-140 kit lens. When I used focus test chart page 18 to test my camera and lens I got one of following result at 35mm/f4.2. I used Nikon's ViewNX2 to open the raw ...
0
votes
1answer
2k views

Canon EOS 650D + Canon 50mm f/1.8 lens calibration

I have the Canon EOS 650D with Canon 50mm f/1.8 II lens. After some tests I mentioned that I have ~1cm front focusing (see this question). Is there any way to calibrate Camera/Lens without ...
8
votes
1answer
666 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
1answer
225 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 ...
6
votes
1answer
254 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 ...