Quote: Gooshin: are you saying that the field of view from a 165mm lens on a K20D is identical to the field of view on your 6X7?
Gooshin, thank you for your question. I do not have a 6 x 7 camera, yet anyway. Thinking about your question I can see that mine is poorly worded.
First, to answer your question---no--the FOV for the 165mm lens cannot be the same on the K20 as on a 6 x 7 camera. The crop factor for the lens on the K20 is 1.5( in relation to FF) of course, and the FOV factor on the 6 x 7 (in relation to FF) would be less than 1 and directly related to its negative which is a good deal larger than FF.
I apologize for my error in reasoning in my original question and thank you for helping me to reason it through.
My question should be this:
What is the FOV factor (a word, opposite in meaning to "crop" need be inserted here, before factor) for the 165mm lens on a 6 x 7 camera--I suspect it has to be less than one--somewhere near .5 if the digital negative of Medium format is 2x that of full frame?
Is this a better explanation of my question?
More succinctly:
165mm lens on K20= FOV of 247.5mm
165mm lens on FF = FOV of 165mm
165mm lens on 6 x 7 =FOV of___________ please fill in the blank