Hi, My camera is an E-PL1. I have three native lenses (14-42 kit lens, 45 f/1.8, and 14 f/2.5) and a bunch of non-native glass purchased on ebay. I almost always shoot in manual mode. On occasion I wanted to use flash but being a relative noob had no idea how to adjust exposure for flash. So with a native lens, I would switch from manual to either aperture priority or auto. Are there any rules of thumb for changing exposure when shooting manual? Thanks in advance!