Image of the day

Captured by
Alexander DiNota

IC5070 Pelican Nebula

My Account

New to Astromart?

Register an account...

Need Help?

Re: Mirror help please...

Started by Gary Klein, 04/17/2006 07:39PM
Posted 04/17/2006 07:39PM Opening Post
Steve Swayze in Portland is very reasonable for testing and refiguring and does an excellent job.

You can do a knife edge test without any special equipment yourself. A better test is the Ronchi which takes a fine grid of lines (not very expensive) near the focal point and projects them onto the mirror and back to your eye. This shows the amount of correction, a turned edge or flat spot, and the smoothness of the mirror.

Gary Klein