CELESTRON C8 xllt

[DAVE AMENDALL]

Hi All, This question has probably been asked before.  Is it possible to use a 2" diagonal, 2" plus 20 mm wide angle eyepiece with the 6.6 focal reducer, bearing in miind that the 2" diagonal is a greater distance from the focal reducer than the 1.25" set up. Would this cause vignetting or distortion at the edge of the field or would a cut off result..........???        Dave

[Davesellars]

I used a 2" 22mm 70 degree eyepiece with the reducer in my C8.  There was no vignetting.  I believe as long as the field stop is less than the diameter of the visual back port (36mm - 38mm... can't remember exactly) then there will be no vignetting as far as I know.

[DAVE AMENDALL]

Thanks for the info Dave. Seems logical to me. therefore I plan to switch to 2" for my C8