Microadjusted AF - problem

Started Feb 28, 2012 | Discussions thread
Flat view
maboleth Contributing Member • Posts: 665
Microadjusted AF - problem


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:


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!

-- hide signature --

http://ivframes.com -- my official site
http://facebook.com/ivframes -- become a fan
http://travelingnome.ivframes.com -- bits of this and that

Canon EOS 7D
If you believe there are incorrect tags, please send us this post using our feedback form.
Flat view
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow