Ronchi and Foucault Tests on the 20″ f/4.5 Quartz Telescope Mirror
Saturday, January 22nd, 2011 at
3:31 pm
Both of the twin 20" quartz telescope mirrors are finished. Gordon puts the "A" disk on the test stand and shows how the Foucault test and the Ronchi test look. This mirror's test is reported by FigureXP to be better than /30th-wave, with a Strehl ratio better than 0.98. This is one of the mirrors that Gordon wrote about in the Cloudy Nights thread entitled "Making twin 20" quartz mirrors."
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US $33.29
I am inspired to try making my firtst mirror. Problem is I dont want anything small LOL. I want to make something 10″ or larger. Prob not the best thing to do as a beginner. Though I may be better off having mirrors made for me I don’t know. I think I’d have more fun building my telescope and have the morors made. I’m thinking a 14″ mirror set. Thank for the great video’s. Cheers, IC.
@skyscraperjim Have fun with the 6″ mirror. Are you making an f/6 or f/8 or what? I’ve been thinking about building a short 8″ f/4.0 just to have something short and easy to throw in the car. Enjoy your project!
Thanks for sharing this process. I’m still in the middle of fine grinding my first 6″ mirror–having fun so far.