On Tue, 17 Jul 2001, Gene Johnson wrote:
> I think "Normal" for that format works out to about 18 inches. I've
> been thinking about an 11x18 too. If one is going to make a camera for
> contact prints, I think that would be a good size.
The "normal" focal length for a film format is usually computed as the
diagonal of the frame. So for the 11x14 case:
(diagonal)^2 = (11)^2 + (14)^2 = 317
making the diagonal = sqrt(317) = 17.8 inches or basically 18 inches.
For an 11x18 frame you'd have:
diagonal = sqrt((11)^2 + (18)^2) = 21 inches
- Wayde
([EMAIL PROTECTED])
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