As a 4/3 shooter, I'm standing on my tongue right now.
However, in the spirit of gloat-free conversation, this is a habit that I
made when I started shooting with the E-1. Almost EVERY time I shoot
something very important I do a stop-downed sky-check. When on a shooting
expedition, I do a test a minimum of once per day. But I change lenses so
often, that it's just one of those "insurance" things I do. Not that I've
ever actually had to dust anything off....
This is not unlike checking the light-path in a film-camera looking for
stray hairs and dust-bunnies. I check that before any critical assignment
(wedding, portrait, event, etc), trips and what-not. I never go beyond five
rolls between checks. Yes, I had a stray hair caught in the shutter-path
one time. Once burned, you tend to not want to jump onto any stove again.
AG
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