Quote:
Originally Posted by Stefan Buda
Good Progress: I made two secondary mirrors, a second Back Plate and Dovetail plate.
I had bought three 120 diameter blanks, so I turned one into a grinding tool and used the rest to make two identical secondary mirrors. Looks quite certain that I will make more than one of these instruments and, in order to bring down the anodising cost, I also duplicated the Back Plate and Dovetail Plate.
Never stops amazing me how long it takes to get an optical surface from about 1/4 lambda to something like 1/10 lambda (on the wave front). The damn law of diminishing returns really tests one's patience.
|
Hi Stefan, what are we looking at? Parallel lines? Can you make the difference between 1/4 and 1/10 just looking at the patterns?