On Apr 21, 2006, at 2:40 AM, Thibouille wrote:

I'm really lost now. Could someone tell me how to convert between
those formats and 35mm?

35mm -> *istDx is  1.5x
35mm -> 645  ??
645 -> 645D ?? (I think it is 1.3x but not sure).
35mm -> 645D  ??
35mm -> 67  ??


The quick-and-dirty measurement for 6x7 to 35mm is to divide in half -- a 6x7 105mm lens is approximately equivalent to a 50mm lens on a 35. My 75mm is slightly wide, comparable to a 35mm lens on 35.

-Aaron

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