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Yes there's a screw visible on the focusing ring Just beneath the ripped surface, same ring as the focusing scale is on. There are 3 screws if I remember correctly - don't unscrew them completely, just loosen them up a bit.
Here's a screenshow showing where:
If I remember correctly, I put the camera on a sturdy tripod, found something to focus on at infinity. Focused all the way to the end (without reaching infinity at first), loosened the screws, turn the helicoid a little to make sure I could reach / overpass infinity, refastened screws. Then opened up Live View, found proper infinity, loosened the screws again, adjusted the helicoid again so it would be correctly positioned at infinity, and refastened the screws, and oilah - got 2 years of great service doing aurora shooting without ever having to check live view again. I could just set the focusing barrel at infinity and start shooting.
Edited on Sep 22, 2013 at 10:13 AM · View previous versions