http://www.petersonengineering.com/S...vignetting.htm
This link gives some good info on vignetting with SCT's.
Basically the std baffle inside the scope is 50mm diameter (max) and the opening in the back of the scope is 38mm so ANY 2" gear will be affected. Remember also the 2" diagonal will also be vignetted PRIOR to the light getting to the 2" eyepiece. Hence the sales pitch for the "eyeopener"
Any have first hand experience with it? Does it give an un-vignetted field of 2"????????