OK, I have this theory about what my GF1 kit is going to expand into and where it will stop. I have the 20mm pancake and will acquire a 12~14mm pancake of some sort after Olympus show us what they're going to offer [hopefully this year]. To complete the trio of fast primes I will be looking for something in the 40-50mm [80-100mm] range. The 14 & 20 are both around the 25mm [1 inch] mark in terms of thickness/length i.e. 'pancakes'. My hope is that I can stuff 2 spare lenses in [probably] 2 pockets without the need for a bag or case - i.e. travelling really light. My question: what will be the size of the smallest length autofocus prime I can reasonably expect to hope for in the short telephoto range ? Is it going to be the size of the PL 45mm macro ?