this post was submitted on 14 Dec 2024
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They seam to have a flatness of λ/2 - λ/4 and are quite cheap, 10 bucks for a 25mm diameter one (that 1/5 the price of a normal 25mm secondary elliptical mirror)

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[–] [email protected] 5 points 1 week ago

I know enough about these kinds of optics to be firmly in the valley of despair on the dunning kruger graph. It's super complicated and well beyond my understanding.