Posted By Thomas Bennett
I also have an 11” Celestron (Nexstar 11 GPS) and agree with all the posts recommending a low power eyepiece since you will likely use this more than any other eyepiece.
One way to do this is to purchase a long focal length 2” eyepiece like my 30mm Widescan III that gives about 93X with a 0.9 degree field of view in my NS11.
Another option is to purchase an F6.3 reducer/corrector and use a longer focal length 1-1/4” eyepiece like my 20mm Widescan III that gives about 88X with a 0.95 degree field of view with the R/C in place. The R/C will also improve the off-axis image by reducing the field curvature that is inherent in older SCT designs – stars at the edge will appear sharper.
Gook luck, Tom