Some were far less sensitive to it than others. I learned that different lenses react quite differently to a miscalibrated camera. To my great joy, all were dead on, even the ones that focused well before I started! With trepidation, I tried the other lenses. I was able to get the 85 just dead-on at f1.8. I was hoping it wouldn't throw the good focusing ones off.Īfter some trial and error, I learned that moving the hex wrench up/CCW pushed focus back (increased backfocus) and moving it down/CW pushed focus forward (decreased backfocus).it works (whew!). My main objective was to get the 85 dead on and figured I'd see if it made the others better or worse. I've been a big fan of Christian Buil's great camera test pages (being an astrophotographer as well), and noticed he told how to adjust the autofocus for the 350D, and after examining the 30D, it appeared the same method should work:īeing a brave/stupid soul, I decided to give it a go. The 70-300 and 17-55 were in great focus, but I found the 300 and 150 were also just a touch off and the 85 was waaay off. I had several other lenses, and they seemed to be fine, so I assumed it was a lens issue.īeing a geek, I decided to test my lenses (85 1.8, 17-55IS, 70-300IS, 300 f/4, Sigma 150 f2.8 macro) using a focus test target (like I recently bought a new 85 f1.8 and noticed it was backfocusing severely on my 30D.
0 kommentar(er)
