I have spotted a Pentacon 300mm f4 in a local store for £40, should I get it for a mixture of wow factor, rarity, uber-tele-goodness or shall I leave it alone? I have seen one good review of it on a Pentax/Praktica users site as a worthy lens in its price/class but otherwise not a lot of info! At least I will be able to photograph a mosquitos testes at long range! p.s. Damn, it comes in at 2.2kg and focused out is a whopping 300+mm long!!!! p.p.s. Better get to the gym and excercise my camera arm, oh and get a stronger tripod! :tongue: p.p.p.s. Does it retain it's full f4 once mounted on a Micro 4/3 body? I assume it will!