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Pentax 67 55mm f/4
I tested the Pentax 67 55mm f/4 on the 645D, using the Pentax lens adapter (no longer made, see notes on the 300/4 page).
I liked the feel of the 55mm f/4; it has a very nice focusing feel and is very solidly built.
Any Pentax 645D shooter would do well to look at all the Pentax 67 lenses; both the 55/4 and the 300/4 are excellent, and there might be other standouts.
Test scene
This is the entire frame as shot.
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