Re: [ATM] Edmund Optics "Techspec" brand achromat: suitable lensfor small refractor?

[David Weinshenker <daze39@earthlink.net>]

Richard wrote:
> 
> Hi Jeff,
> 
> Monday, August 20, 2007, 4:26:58 PM, you wrote:
> 
> JR> similar products that might work as well at lower cost
> 
> I don't think there's much similarity between a tech spec lens and a
> Jaegers objective. The Jaegers lenses were excellent and a top of
> the range product when they were available. Surplus Shed bought up the
> last of their stock. Something like this one would make a very nice
> scope :
> 
> http://www.surplusshed.com/pages/item/l3647.html

Hmmm... interesting: 83mm x about 1m focal length (about f/12.5) -
I note from the photo shown that it appears to be designed to be 
installed as an air-spaced lens, since it is shown as a pair of 
uncemented elements. How hard is it going to be to discover the
correct spacing for such lenses? (If I know the correct spacing,
I should be able to find suitable material for shims.)

-dave w
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