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

["Ukyo Chen" <ukyochen888@hotmail.com>]

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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