I have an 8 inch F5 Newtonian Reflector, the complete series of the of the XWA/Stellarvue 100 degree eyepieces, and a Tele Vue Paracorr type 1. I have tried them a few times sans Paracorr, and every time I am happy I have one to put in the optical chain. The coma corrector really cleans up the view nicely especially at the longer focal lengths.
Without a coma corrector edge performance increases as the focal length decreases. The 20mm without a coma corrector has the worst edge performance of the series.
Something to consider is that the Paracorr also decreases the exit pupil size since it increase the F ratio from 5 to 5.75.
The 13mm with a Paracorr gets you closer to a 2mm exit pupil and the 7mm with a Paracorr gets you closer to a 1mm exit pupil.
How much coma detracts from the view varies from one observer to the next. I like pinpoint stars going to as close to the edge as possible. I didn't know I liked it until I tried a Paracorr.
Another thing to consider is what happens next. I picked up a 9mm 100 degree eyepiece and really liked the presentation. So much in fact that now I have two sets of eyepieces.
1. A Super/Ultra Wide set (70-82 degrees) including XW's, Morpheus, and Naglers
2. An Ultra/Hyper Wide Set (82-110 degrees) including Meade UWA, Stellarvue, XWA, and Ethos
Edited by vrodriguez2324, 28 September 2021 - 07:56 PM.