[ATM] 8" Astrograph

["Robert Turner" <rbturner@charter.net>]

Hi,

 

I am interested in building an 8" F4 astrograph for 35mm film photography. I
have found a little information about coma correctors and specifically the
Lumicon corrector. Reading I discovered that they leave some spherical
aberration which can be corrected by overcorrecting the primary. I did not
however find the specific overcorrection needed to fix the spherical
aberration. Does anyone have some information that would help me design such
a system using some kind of coma corrector at F4? 

 

Robert


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