Hello all, I've just got my very first interchangeable lens camera, the GF1 with the 20mm kit! I've been trying to find out about the lens, but understandably most of what I've found talks about technical aspects of lens quality and assumes its readers will know how to use the thing! Sadly I don't yet, and so I was wondering if anyone here could help with two queries I have about how to use the lens? Firstly, I've read Bryan Peterson's 'Understanding Exposure', and he recommends using the lens at a very wide aperture for subject isolation pics, f8 or f11 for objects at the same focal length and f22 for compositions where you want both foreground and background to be sharp. On 'A' mode I can only get the GF1 down to f16, however. I'm wondering if the smaller crop of the 4/3 sensor affects which aperture settings produce these results? If so, which settings are equivalent to Peterson's f8/11 or f22 on a 4/3 sensor? Secondly, the lens says its focussing distance is from 0.2m to 'infinity'. Now, obviously 'infinity' can't actually mean infinity; at what distance does it decide the focussing distance is 'infinity', and what are the effects of this on depth of field? I've been surprised that the camera always seems to want to shoot at f1.7 unless I specifically tell it not to, so it seems an important thing to know! I hope you can help me!