Revisiting Diffraction with an Apodized "Iris"

Started 11 months ago | Discussions thread
Jack Hogan Veteran Member • Posts: 6,507
Re: Revisiting Diffraction with an Apodized "Iris"

OpticsEngineer wrote:

Looks pretty good, matching what Zemax shows using Gaussian apodization with an apodization factor of 2. A(r) = exp(-2*r^2)

I didn't participate in the previous thread on this. But in case it was of interest to someone, we get pretty much complete suppression of the Airy rings with an apodization factor of 1 (A(r)=exp(-r^2) ) without reducing the high frequency response nearly so much.

Hi OpticsEngineer,

In the other thread ProfHankD suggested that apodizing functions for photographic lenses typically look nothing like a gaussian:

"The apodization in the 135mm STF is not Gaussian -- literally, a plano-concave spherical "smoked glass" element bonded to a matching plano-convex element of the same index. In fact, I've played with Gaussian apodization, and it doesn't look anywhere near as pleasing -- fall off is too abrupt."

What's your experience?

Jack

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