Things You Didn't Know You Needed To Worry About

[Harold]

Here is a website, based on Olympus the OM film system, which gives much advice that applies more generally to lenses, flash, etc.

brashear.phys.appstate.edu/lhawkins/photo/olympus.faq.html

If you run out of things to worry about there try the main site:

www.datasync.com/~farrar/zuiko.html#bellows

Harold