| DAVIDG |
| (Carpal Tunnel) |
| 07/03/09 10:54 AM |
Re: flat mirror tests
|
Quote:
I guess you could set up a telescope at the right distance away with an ordinary mirror folding the path down to eliminate the collimating lens. Might work.
That is almost exactly what Dick Parker did and was written up in his ATMJ article on doing the test. He hang a Netwonian off the ceiling facing down and put a neon bulb at the focus. Dick came to the Delmarva Mirror Class this year with beautiful autocollimation setup in which he made the 12" flat via the water test.
- Dave