Im really confused about this. My sigma has hit focus from time to time but I never felt like I could rely on it. Well while at a recent shoot I was distracted and forgot to zip up my lens bag, when we started to change location my sigma fell out of the bag from about 3 1/2 feet up. The lens took a hard bound on a bench then fell on the cement ground and started to roll towards the edge of a balcony. Luckily I stopped it before it took a ten foot drop. After inspection everything was fine except for a few scuff marks on the lens hood.
Tonight I took it out to make sure it was alright. I tested the lens on various items around the house that I used in the past to test af accuracy..... Its like its a new lens, af was spot on 90% of the time!!! I don't see how a knock to the lens could improve the focus accuracy, but I dont really care. I think my 30mm is fixed.
Oh and I just want to mention that when testing the focus indoors I was using shooting at 1/125 to insure that the focus issue was not because of a slow shutter speed both times.
PS dont go throwing your sigma on the ground to try and fix it.
