Howdy!
i want to get close to the same flat field that an RC would give me, but it appears i have champagne tastes, on a beer budget.
So, here is my plan...
the secondary on my 200mm F5 scope, is a little too small, i can really see it with severe vignetting on my images, although there is no surprise in that, i already have an MPCC, that i cant use with the QHY8 at present, as i need to get around to ordering an adaptor from Peter Lee in HK, but at any rate, would a larger secondary, and an MPCC give me much of the same effect as a 200mm RC?
my thinking is, the larger secondary would help with vignetting, and the MPCC would give a flat field, buy what do i know, thats why i am asking on here!
anyone care to postulate what size secondary i would need?
