I have the 645 1000s with 45mm, 80mm w/extension tubes for macro, and 150mm. I use all three lenses frequently. Note that the 45 is equivalent to a 28 on a 35mm camera - my most used lens - I found that a 35 on a 35mm camera was often not wide enough, therefore, I have no interest in the 55 for the 645 (just my opinion). Great little camera. I say little because my RB is my camera of choice for more serious work.