eric_astro
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Posts posted by eric_astro
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I'm looking for a cold mirror. they all seem to have 2-6 lambda surface flatness unless you spend $3000 for 1/10 lambda.
I've tried Edmund Optics and Thor Labs.
Anywhere that would have something for a reasonable price?
Home made ONAG (On-Axis Guider)
in DIY Astronomer
Posted
Looking forward to your test results. I have a Meade flip-mirror that I will modify. It's odd that they spec the transmitted beam wavefront, but not the reflected beam.
The dichroic from Edmund Optics (#69-903) is 1/4 wave for the transmitted beam, and no spec for the reflected beam.
They also don't provide the reflection/transmission curves past 535 nm. So even the tech didn't know how far into the blue it works.
In the end, the EO tech suggested a pellicle - great transmitted beam, terrible reflected beam. But have to give up light to the guider.