Hi all,
I have a question for someone who has made their own mirror. I have figured a 17" blank of 19mm plateglass, and put it into the future telescope assembly. I can view the moon sharply at 840x magnification, Jupiter to about 350x (due to bad Sydney seeing at present), and defocussed stars have fairly equal rings both sides of focus, with no sign of astigmatism. Does anyone know if this is a good enough indication that the mirror could be coated? Mel Bartels says it should magnify to between 30 and 50 times per inch of aperture.
cheers,
Frank
|