On Mon, 8 Mar 2004, Jens Bladt wrote: > About standard focal length for the *Ist D. > Is it true, that a "normal" lens for the *ist D, with a CCD of 23.5 x 15.7 > mm is equal to the diagonal of this rectangular square? If yes, the standard > focal length should be 28,3mm. > This calculation (Phythagoras) gives us a 43.3 mm standard focal length for > the 24x36mm format. This will result in a factor (35mm film/CCD) of 1.53.
Yes, this makes 28mm the true normal lens for the *ist D. If you prefer 50mm normals (instead of 43mm) on 35mm then the 35/2 is a good normal for the *ist D. It has the same field of view as a 52mm lens on a 35mm body. It isn't as fast as the 50/1.4, but 35/2 is still respectable. alex
