Are co2 Laser mirrors Flat enough to be used as secondary mirrors in Newtonian telescopes?

einfach_orangensaft@sh.itjust.works to

Ask Science@lemmy.worldEnglish · 26 days ago

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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