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|Focal Length||55 - 110 mm|
|Camera Mount||Pentax 645|
|Angle of View @ Infinity||53° - 28°|
|Minimum Focus Distance||2.62' (.8 m)|
|Filter Thread||Front: 82 mm|
|Weight||1.10 lb (500 g)|
|Dimensions||Approx. 3.46 x 4.09" (88 x 104 mm)|
Useful focal range, very sharp, excellent @ f/11 and f/16, inexpensive.
Better avoid f/5.6 and f/45.
I'd hoped this lens, which seems to have a similar optical layout to the greatly respected P67 55-100 lens, would be as sharp. Wide open, the lens is very soft in the outer 1/3 of the frame. Not until stopped down to f8 is most of the frame sharp and contrasty. By f11, the whole frame is sharp.
small and convenient
not sharp until f8-f11; req large 82mm filters
This is based on one sample on one 645z body. Comments refer to the central area of the lens only, as for my images I don't much care if the corners go soft. I also don't concern myself much with distortion, as it's so easy to correct. Most all of my images are in good light at base ISO.
Relatively light and compact
Feels cheap it's so light, 82 mm filters are expensive