Re: ATM 8" mirror questions - weight, good sources, mirror cells?-reply

[ab866@freenet.durham.org (ric rokosz)]

Michael Spooner writes:
> 
> ric rokosz wrote:
> > 
> > santryl@cadvision.com writes:
> > >
> > >
> > >    Do you want the very best?  Barry Arnold of Arnold Optics, 433 Sioux
> > > Road, Sherwood Park, Alberta, T8A 4H2 (403)467-4781 makes excellent
> > > mirrors.  Our 20cm f6 mirror cost 450 Canadian, for primary and matching
> > > secondary, last spring.  With a U.S. dollar buying about 1.3 Canadian
> > > ones, you can get quite a deal on a premium product.
> > >
> > Seems those Canadians sure aren't cheap!Heard that Ceravolo charged a guy
> > $500 CDN to refigure a 6 inch f/6 mirror.
> > 
> > Ric
> > Toronto
> > 
> > --
> 
> After spending some not few hours making a quarter wavefront 8" somewhat 
> better, those costs mentioned seem reasonable.
> 
> Priced a good 6 to 8 inch APO lens lately? ;-)
> 
> Mike
> 


-- 
Mike
I got a note from Bob Goeff of AXE and he too felt the price was
reasonable.Perhaps I find the process so easy that I don't think of the
time needed.With a optical flat or Ross null lens the process for me at
least seems very simple: just a matter of watching the stroke pattern and
"knowing" where your hands are and the amount of constant pressure being
applied.Even before I had the flat and Ross lens I did a 12 inch f/6
mirror by just reading the center and edge zones and keeping the crest at
the 70% zone.The star test on this mirror showed it was a good
mirror.Perhaps I should set up a part time business.<g>

Ric
Toronto