> I'm not by any means an expert on optics, but here's what I've read any my > understanding (I'm sure many of you already know this): The focal length of > a lens does not change when you put a lens on a digital camera with sensor > smaller than a 35 frame of film. Wrong: that has been the case since the dawn of optics (centruies ago) but the digital "revolution" has changed all that. Now focal length is officially defined by the angle of view of an equivalent 35mm camera (judging by what the experts write in camera mags)
> A non-full frame digital camera gives a crop, NO! That is "oldspeak". Crop is such a negative word, it implies losing something, definately not an attribute to push in the advertising campaigns. Modern terminology (a spin-off from the advertising spin doctors) is of "focal length multiplication factor": a real bonus of using a smaller sensor. No more do you need expensive big lenses. The smaller the sensor the bigger the focal length: "infinity in a single pixey" ;o) > i.e. you could achieve the same with film (resolution and depth of field > aside) by cropping to a smaller part of the frame and scaling that part up. Doh, Heretic! Before you know it people will be using masking tape to achieve "focal length multiplication" of thier film cameras ;o) P * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
