Re: crop factor vs. telephoto factor

[Adam Maas]

William Robb wrote:

----- 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

Indeed I did. I was referencing 5x7.

-Adam