Hi all I know this is old "news", but... I done some figuring. About resolution on film: If a good lens (Pentax?) can resolve 100 line pairs per mm. It will take 3 pixels, right - per line pair? Black-White-Black. 100 times fore every mm. Or 300 pixel per mm. That equals about 10.800 (3x100x36) pixels through all 36 millimeters, right? This equals 7500 ppi (10800/36*25).
My lenses resolve between 50 and 85 linepairs per mm. That equals about 5000 ppi. 5000 ppi is currently known as "The Sound Wall" (MACH 1) of digital photography - and (almost...) the present level of "state of the art" film scanners. Annother thing: The new Kodak 14MP (4500x3000) camera with 24x36mm CMOS equals appr. 3125 ppi (4500/36x25). Very good! We're getting there, aren't we? I mean since all pro photographs goes digital anyway (for printing), it doesn't make too much sence to compare to the negs (except for slides) - but to a scanned neg, which most of the time will be something like 2200 ppi, anyway. Is this incorrect? Regards Jens
