Ethos don’t have enough eye relief to see the whole view with glasses. Delos would be more the ticket if wearing glasses. There are a few other excellent options also if you aren’t married to Televue.
Celestron Xcel LX typically have just enough eye relief to take in the whole view with glasses. At least for most users. You say you are struggling with the eye relief. Are you having problems getting close enough with glasses to see the whole view? Or are you having problems with the view blacking out if you don’t keep your eye in the right spot? This is a common issue for beginners using wide angle eyepieces. If you like the 30mm, then maybe something with a bigger eye lens would help. Such as Delos and a few others.
A little bit of both, but I keep bumping the eyepiece with my glasses. I don't have this problem with the ultima edge 30mm at all. I don't even really need to touch the cup to view, but even if I do end up moving closer in, it's a nice soft rubber that I don't have to worry about scratching my expensive RX lenses. I don't need to touch it, but I have to get so close that I often end up do touching it on accident and I just worry about scratching my glasses mostly.
I have the 6mm and 4.7mm Ethos and also the 7mm, 5mm and 3.5mm Pentax XW's. For the glasses wearer I think the Pentax XW's (and similarly the Delos 6mm and 4.5mm) will be more comfortable to use than Ethos's and will offer equal if not slightly better optical performance.
My 12 inch dob is F/5.3 and the above 7mm - 4.7mm focal length eyepieces get lots of use on the right targets under decent seeing conditions. The 3.5mm Pentax not quite so much but still is useful under excellent conditions.
Something like this? https://www.bhphotov...iece.html/specs
Dangling a barlowed 13 Ethos of a tiny 1.25" diagonal is a little scary.
I'm not sure what you mean by this? I wish I could try an ethos before I buy, as they are stupid expensive. What I do know is that my ultima edge with 20mm eye relief is very comfortable for me to view, so maybe I should just get the delos. The lx 9mm is 16mm of eye relief and I seem to bump it constantly.
I suppose eye relief is probably more important than the greater 100 degree AFOV of the ethos? My assumption is all the AFOV in the world probably won't matter if I keep banging my glasses into it trying to see.
As a side question, how does barlow affect viewing? Does it lower brightness/contrast. The ability to get multiple magnifications from my eyepieces is appealing, but I'm not sure what the downside would be, if any?
Edited by ApexAZ, 17 May 2021 - 02:36 PM.