Diffraction f/Entekaphobia

Started 7 months ago | Discussions thread
falconeyes
Contributing MemberPosts: 888
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Roger is almost correct
In reply to Robin Casady, 7 months ago

The problem is people are confused by what everybody writes and it is hard to really understand.

Even Roger Cicala, as much as I respect his work, suffers from this sometimes. He way too much uses MTF50 as his only tool.

As a matter of fact (and as you will learn when really understanding MTF) information (detail) isn't fully lost until you reach about the Rayleigh criterion (about f/13 for the D800E pixel pitch). It then depends on other factors (such as noise) how much detail you really captured. Certainly much more than suggested by MTF50. The detail is recovered via sharpening or smart sharpening.

In the good old days, it was good practice to compare MTF5 or MTF10 when speaking about resolution (the Rayleigh criterion corresponds to 9% contrast or MTF9).

I don't say Roger is wrong. But unfortunately, this particular article doesn't mean much as he missed to measure and compare MTF10.

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Falk Lumo

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