Originally posted by EssJayEff I realize that at 35 is a 35 is a 35 . . . I meant in terms of its angle of view.
---------- Post added 03-29-16 at 07:14 AM ----------
Now that it's no longer 6:00 in the morning, let me clarify my question. I've never worked with a "crop factor" that was less than 1.0. I understand that a full frame 35mm lens produces an image circle that is larger than an APS-C sensor, hence a crop factor larger than 1.0. I saw something (OK I'll blame
Ken Rockwell's chart "645 Lens 35mm Equivalents") that says the crop factor for the 645 film format to 35mm sensor is 0.62075x, with an angle of view for a 645 35mm lens being equivalent to that of a 21mm on a full frame 35mm camera. This makes no sense to me. The 645 lens is creating an image circle that is larger than a 645 digital sensor, so naturally the image circle is also larger than a full frame 35mm sensor. So why wouldn't the crop factor still be larger than 1.0 when using a 645 lens on a 35mm full frame sensor? A crop factor less than 1.0 to me implies that the
sensor is larger than the image circle. Why would a 645 35mm lens act like a 21mm on a camera with full-frame 35mm sensor? Where am I getting confused?