Looking for opinions on this eyepiece's performance in an SCT at f/10.
I've got a Celestron Ultima 24mm and Celestron XCEL-LX 25mm both of which are wonderful but I'm wanting a bit more FOV.
I had the ES 82º 24mm but didn't like it. So I'm curious about the 68º model.
I had a complete set of Celestron X-Cel LX. I also had an ES68 24 mm which I used with f/12-f/15 Maksutovs. ES68 24 mm is very contrasty, sharp over most of the field of view and very well built. Significantly better than the X-Cel LX in my opinion. Still I sold the ES68 and all the X-Cel LX after a couple months however. Why? In the case of the X-Cel, I was just not happy with kidney beaning and eyeball reflections. In the case of the ES68:
--It is a bit bulky--no big deal really.
--Rubber eyecup, not twist-up eyecup--again no big deal.
--But big deal for me: the 68 degree AFOV is achieved via a good amount of pincushion distortion. The ES68 24 mm has a 27.1 mm field stop, which should give only 59 degrees apparent field of in the absence of geometric distortion. Somehow, absence of pincushion/barrel distortion is important for me, I do terrestrial observing sometimes and that aberration bothers me. The true field of view of the ES68 24 mm is about the same as in a Paradigm 60 degrees 25 mm. Which has comparable sharpness, contrast etc. for half the price and very little geometric distortion.
So in the end I got a whole set of Paradigms (Agena Dual ED Starguiders in fact). But that's just me! Have fun shopping.