Originally posted by Dana G I've never used TTL flash, so I don't know much about it, but it's not necessary for correct exposure.
Same here - I've had a DL (now a K100D) and a bunch of old M lenses, and without actually knowing enough about flash photography I manage to get acceptable results with a minimum of messing around. If I would just write down the relevant guide numbers and formulae I'd probably do fewer test shots, although I'm surprised how well I can do just guessing!
TTL and P-TTL are a convenience. If I'm feeling lazy, I'll stick on the kit lens and P-TTL flash. It would be nice to have the same degree of automation with my old lenses, but I don't, so I'm learning guide numbers (sort of).
Julie