I just got my olympus e-pl1 with kit len 14-42. This is my first camera so I am sure I will have tons of questions. I have basic know of aperture, shutter speed, dof etc ... I noticed that in indoor situations using the P or iAuto setting the camera tends to use the 1600 iso. I know you can customize the limit. But would 1600 be a good compromise for a slower speed or smaller aperture? I mean would you rather go with a higher iso, or smaller aperture or slower shutter speed? which parameter would you sacrifice first? What is the tolerable level for each parameter. of course, getting the panasonic 20mm/f1.7 will help a lot but same question applies. second question. I know the ibis give you an improvement of 1 stop ie 1/10 s to 1/20 s. Do you get this free from pure optics as compare to a non-is system? So if I mount a non-is len with the olympus vs g1 which does not have ibis the olympus will have a one stop advantage? Thanks.