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Re: [ATM] Why Lurie-Houghton telescope very rare in the ATM or market?

I had the same question. Nagesh Kanvindeh and I are
making a L-H right now, so that will make four of
them.
Guy

--- Ukyo Chen <ukyochen888@hotmail.com> wrote:

> Dear all,
> 
> Lurie-Houghton telescope use convex & concave lenses
> combination to correct 
> sphere mirror, it do perform a good image (diffract
> limit) compares with 
> Newtonian, Schmidt-Newtonian and Maksutov-Newtonian.
> Also L-H telescope has 
> wide tolerance in surface radius, lens distance, all
> surfaces are smooth 
> sphere. It only get a little distortion at the field
> edge.
> 
> Just wonder why seldom ATMer or factory like to make
> this type of telescope. 
> I only know Rick Scott, Roger Ceragioli and Aki
> Lötjönen had made their L-H 
> telescopes.
> 
> Best Regards,
> Ukyo Chen
> 
> 
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> ATM mailing list http://www.atmlist.net/
> 


Guy  Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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