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Originally Posted by gregbradley
From memory there is a Pentax 67 45mm lens. I used a guide with reviews about each to chose from. The 55mm F4, 165mm F2.8 and
300mm F4 get good reviews. The 300mm F4 EDIF is the best but its a long focal length for a camera lens, rare and expensive - about US$1500 to $2000. But see Marco's wonderful images using one. I have the 55 F4 the 165 F2.8 and the 300 F4 (non EDIF). They all seem sharp but the 165mm seems to me to be the best of those 3.
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Thanks for the info - explains why I keep seeing the same few lenses in use everywhere.
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My PL16803 is twice the size of 35mm format almost so I suppose there is a negative figure you apply like -1.9 or something compared to 35mm format lenses. It seems pretty wide at 55mm. Probably similar to the field of view of about 18mm with my 40D.
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Aah, I'd forgotten about the "reverse crop" factor. The PL16803 + Pentax 55 mm sounds like a killer combo for wide fields.