I recently purchased some old OM lens's for my E-510. These lens's are all manual and I've read that I need to do stop down metering to use them properly. I've never heard this expression and I can't find it in my manual. I'm thinking I would use spot meter...with the f-stop pre choosen on the lens....I'll play around with it but thought i would ask. Just wondering if someone has the cliff notes on it. Thanks.