Microadjusted AF - problem

Started Feb 28, 2012 | Discussions thread
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maboleth
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Microadjusted AF - problem
Feb 28, 2012

Hello,

I have experienced weird backfocus issue with my trusty 50mm f1.4 and Canon 7D - well, sometimes.

Yesterday I did AF calibration as described on this site:

http://www.northlight-images.co.uk/article_pages/cameras/1ds3_af_micoadjustment.html

I got the best results at -14. In fact, it was 100% perfect with that setting. It was a night time with tungsten bulbs around the house (however, the test was done on the monitor with 6500k).

Today I went out with the camera to do some shooting outdoors. The camera just couldn't focus at infinity. And everything else was not in the focus - uh-oh front focus issue!

So I disabled -14 adjustment and viola - everything was perfect or near perfect... with +1 or +2 MA setting it was a dead on.

But now I'm wondering what the hell is going on here? Why did I get -14 on the test and why my camera suffers back focus in low/artificial light? However, I already said that, the test was done on the monitor that has 6500k, so I thought that would fool camera's AF module to think its a daylight, but seems it's not the case.

Did anyone experience something similar? Any tips? Thanks!

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Canon EOS 7D
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