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Boat telescope 2.0
On Tue, 26 Aug 2008 22:52:24 -0400, Wayne.B
wrote: On Tue, 26 Aug 2008 19:31:21 -0700 (PDT), wrote: Progress while waiting for Fay to go away. Finished rough grinding yielding a focal length of 24" (this is a 100 mm diameter f 6 mirror) and finished the #120 grit and have started on the #180. My magnifications will be a low of 15 X an a high of about 30X. How do you know when you have the shape just right? There are optical tests with simple equipment. What do use as a blank? Two discs of pyrex from a mail order house. One is the mirror, one the tool. You put grit on them and rub them together. Casady |
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