I went over much (and more) of this in my introduction thread - I'll try to rehash as little as possible. I just bought an Olympus PEN E-PM2 with two lens kit (M.Zuiko 14-42mm f/3.5-5.6 II R and M.Zuiko ED 40-150mm f/4-5.6 R). Additionally, I purchased the Panasonic Lumix G 14mm f/2.5. Before this setup, I've had P&S cameras that cost < $150 (if that). So, when and how would I use these lenses? I've enabled SCP, and from the little I've read so far, I think I'm planning on Aperture Priority mode. In this mode, the camera will choose my shutter speed, but what about my ISO - do I set that? How to I know what situation calls for which ISO setting? When would I use each respective lens (this is ALL new to me)? Thank you for your time.