Re: Grinding a flat

Jan R. Sugalski (afn19866@freenet.ufl.edu)
Tue, 2 May 1995 01:09:02 -0400 (EDT)

The method of testing flats against a spherical mirror is not very reliable and I remember reading where some experienced opticians do not recommend it. This was the method I first used when I began making flats but I could never get the accuracy close to the results I got with interference pattterns. In my opinion interference patterns give the highest accuracy by far. Jan

Pushing glass will set you free!

On Tue, 2 May 1995, Bratislav Curcic wrote:

> Date: Tue, 2 May 95 09:35:58 EST
> From: Bratislav Curcic <epabcc@epa.ericsson.se>
> To: atm@best.com
> Subject: Re: Grinding a flat
>
>
> Read a "Bible" again. Texerau gives a good example of making a flat
> by testing it against a spherical mirror (Common test ?). I think that
> the same/similar method is described in Advanced Telescope Making
> Tecniques. If memory serves, there is a sizeable chapter by Strong in
> ATM II or III about making flats as well.
>
> Bratislav
>