Hello, I have just aquired the beautiful 21mm biogon lens in chrome for my black G2 (looks surprisingly beautiful). Just a few questions... Firstly any advice on using the lens; secondly is there a filter available for the hotshoe viewfinder to protect the front optic. Also, people mentioned that the hotshoe viewfinder will fall off, so what is the best way to prevent this. Finally, how bad is parralax error when shooting close up? for some G2 shots visit my portfolio at www.urban-exposure.com THANKS IN ADVANCE.