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. A 300mm lens remains a 300mm lens. A 16-35mm remains a 16-35mm. What does change, however, is the (field) angle of view, so a 300mm will have the angle of view of a 480mm (1.6), but it will still be a 300mm lens. A non-full frame digital camera gives a crop, 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.
I think I got that right.
-- - Marius
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