Re: [ATM] ATM Edmund secondary mirrors - worth it?

[John Lynch <john_lynch2005@yahoo.com>]

Gil,

I've had good luck with ProtoStar.  In addition, the
Pyrex secondaries are certified to the accuracy stated
($75.00) and if you purchase the ULS Quartz ($137.50),
they'll provide you with an analysis of the secondary
(interferogram).  Both are, by the way, out of stock
currently according to their website.

John Lynch

--- Gil McFarlane <gilboastro@yahoo.com> wrote:
> In looking for a 1.8"  secondary for a flex mirror
> scope, I found that Edmund has some on sale: $46 -
> but
> nothing is a bargain if it doesn't work well.  Any
> thoughts versus antares or protostar for about $75? 
> 
> 
> Is it possible to see the difference between a 1.8
> and
> a 1/12 wave optic?
> 
> Are these measurements valid?
> 
> Thanks,
> 
> - Gil
> 
> 
> 
> 		
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