Re: ATM Wide Field Coma Corrector

[Aplanatic@aol.com]

Hello Eric:

> first I want to say that I know nearly nothing about the design of
>  corrector lenses, but I'm interseted in learning more about that in
>  order to make a Newtonian astrograph in the future.
>  There is something I don't understand with this design. How can it cover
>  a 4" field if the lenses are only 60mm in diameter ?

OSLO uses the semi-aperture as its input parameter.  In other words, the 
actual lenses are twice this in diameter.  In editing the OSLO text file for 
inclusion in my post, I removed the word "RADIUS" from APERTURE RADIUS, in an 
attempt to create a clearer format.

My apologies for the confusion.

Dave Rowe