Ok a short statement: My lenses: - Sigma 17-35 f2,8-f4 great wide angle and I need the 17 cause + the 1,6 converter in the 10D it gives me someting around 26 - Canon 50mm f1,4 USM Great lens. Perfect for shooting in low light. - Canon 100mm Macro f2,8 USM This lens is fantasic wonderful DOF and brilliant image quality. - Canon 70-200 f4L USM + 1.4 converter This lens is fantstic. A very sharp lens and cause I have it without IS and with f4 it's still pretty light. So I can take it for hiking trips.