Just a fun technical note, if you put the lens on a Canon body (e.g. 5D mark 2) and hold the DOF preview button to stop the lens down and then eject the battery the aperture will stay stopped down.
I have no idea if that's bad for the lens, and of course it's much harder to focus/compose at f/11 than wide open! But when you have no other option (like having a pre-production body without the ability to stop down the lens)...
Doug Peterson
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Head of Technical Services, Capture Integration
Phase One, Leaf, Cambo, Canon, Apple, Profoto, Eizo & More
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