Ok I know that a focal length of 210 is 210 for 4x5 and about 63mm for 35mm, but what about 120 or medium format. I'm asking because ill be using 120 as well a s 4x5. My real question is about exposure compensation when using 120 instead o f 4x5. With the 4x5 film I know that I should employ bellows factor at any bell ows draw over 210mm (as read from the scale on the rail). But, if the 210mm len s equates to say 80mm because of the difference in film size with the 120, would I compensate at any bellows draw after 80mm as read from the scale on the rail? Also I need to know what the equivalent focal legnth is for the 120 when compa red to 4x5 so I can properly meter the scene.
I've checked Stroebel's book on this and did not find any information.
Any help is appreciated,
Clark King
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