Re: Astimatic Secondary
Rik Hill (rhill@LPL.Arizona.EDU)
Mon, 10 Jul 1995 14:32:09 +0700
> My newtonian secondary (the one with the astimatism)
> came with chunks of foam stuffed in behind it to hold it in place in it's
> holder. Any ideas on how to assure even preasure across the surface of the
> mirror? Moving the foam around has only changed the astimatism but not
> gotten rid of it. Is this a hit and miss adventure or is there some other
> method for securing the mirror? This would not be the first thing I found a
> better way to do over the manufacturer if there is one. Thanks in advance
> for any help or ideas.
>
I prefer cotton wadding. The foam may be too stiff.
-Rik