Re: [ATM] Re: Maksutov corrector minimum thickness

[Ken Hunter <atm_ken_hunter@yahoo.com>]

That's what I was afraid of... Too thin even if I
gained the flat second surface advantage. So... What
to do with 3 blanks of fused quartz 20 inches
diameter.

Newt binoc's? Seems a waste. Guess I'll just leave
them packed up until I find a proper use for them.

Thanks for the answers and running the numbers guys!

Ken Hunter


--- vladimir sacek <vladis.2@juno.com> wrote:

> Minimum thickness of a Maksutov corrector is one
> that would 
> efficiently keep its shape. But the thinner it is,
> the more curved 
> it needs to be for any given power. 
> 
> I run Rutten/Venrooij's TDesign for a 20" Mak-Cass
> (f/4 to f/16 and f/20)
> with 1.46 (fused quartz) corrector index. With 1"
> corrector thickness,
> needed radii are around 27" (average), with nearly
> 2" deep curves.
> It would require 5"+ thick blank to make such
> corrector. 
> 
> For thicker corrector, radii relax somewhat, but
> needed blank thickness
> doesn't change significantly. 
> 
> No luck with this one...
> 
> Vlad
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> ATM mailing list http://www.atmlist.net/
> 



		
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