----- Original Message ----- From: "Gautam Sarup" Subject: Re: crop factor vs. telephoto factor
Adam, Using the diagonal as the standard one would expect the normal for a 8x10 frame to be about 325mm while the practical standard as you mentioned is only 210mm. That's approx. only 65% of the diagonal. Do you know where the large difference comes from?
Adam mixed his formats up. A 210mm is closer to standard on a 5x7. William Robb
