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Latest Review Posted SMC Pentax 67 55-100mm F4.5
I am using this lens with the 645D, and it is superbly sharp right to the edges at all focal lengths (I found the same thing when using it with the film on the P67) . My testing suggests that f8, f11, and f16 are optimal when using this lens with the 645D. With the 645D, the "slow" f4.5 means nothing, since I can shoot at ISO 100, 200 or even 400 without noise issues. If you are used to P645 lenses, this 55-100 zoom will seem very large and heavy. If you are used to P67 shooting it is an easy and comfortable transiition. This is the lens that I use most often. Addendum: I am using the Lee system with a 95mm adapter for both CP and GND filters.

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