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Originally Posted by OzEclipse
Raymo didn't use my formula to generate the table. I think it's a table based on the old 35mm film rules that my formula is attempting to update. These old formulae are based on assumptions about producing prints of a certain size from 35mm film.
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Didn't think of that possibility.
Quote:
Mine allows you to optimize to a specific output size.
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I've made up a spreadsheet in Open Office, but it is specific to my set of lenses and cameras.
With your example f=300mm, d=40°S, n=12 and my gear p=3.89, I'd get 2.8 sec