[APML]: lets talk more newts

["Bobby Middleton" <bobbym@webwide.net>]

I would like to pose another question [actually several :-)] 
about Newtonians before the group while we are on the subject. 
Fast newtonians are known to have coma, which I understand 
to be blurred and elongated stars around the edge of the negative. 
I presume it would also affect visual use. Would an 8" f/4
be pretty severe in this respect, and will it be correctable
with a good coma corrector? By correctable, can one 
expect complete sharpness across the entire negative 
for 35mm film? 
Lumicon makes a coma corrector that is designed for a f4.5 
system. Anybody using it with good results? What other 
correctors are on the market?
Thanks for the info as always,
Bobby Middleton



astropics at:  http://www.webwide.net/~bobbym/astro1.htm