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An update on my progress in making the secondary cassegrain mirror. I just finished the concave hyperbolic reference and tested it with a ronchi screen and it looks fine. I'm going to do an inteference test on the secondary using the concave mirror as a test base. Hopefully the secondary will come out reasonably spherical when I finish polishing it so that I don't have to do too much retouching when I start to figure it. This is the most challenging part of the project. I'm going to start building a new tester for the secondary in the next couple of days so that it's ready when the mirror is polished. Still a bit to go but hopefully I'll have it finished before the end of october.
Regards Cristian
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