I'm not sensitive to eye relief and have owned and used all 3 generally discussed hyperwide brands in most or all the focal lengths offered in each brand. The two I have kept in my kit are Ethos (21, 10, 6, 4.7, 3.7) and the APM's (13, 7). Those make up my main eyepiece kit. All of the Ethos and APM HDC's are quite comfortable. IMO if you have relatively normal eyes and face shapes (whatever that may be) these eyepieces will be comfortable. I use all focal lengths available to me without consideration of comfort or performance in the field as both ep types perform really well for the observation, handle easily and are equally comfortable. The HDC's may have a very slight edge in ergonomics as they are a bit lighter, have knurling my fingers like and have the eye cup design I most like: one that does not have to be manipulated but is always at the right height to place my eye where the full field can be seen just by seating the eye so the cup barely touches my face. And of course their caps fit and stay on much better. But TV don't do caps well at all.
Others with special needs may find one or the other less comfortable but those are outlier circumstances. Such a user may be best served by the Morpheus, which I have not used but respect due to their wide acceptance and appreciation among experienced and capable observers, and/or Delos, with which I do have experience.
I had the refractor at some friends' lake house a couple of weekends ago as they'd said they might enjoy it. I took an ES68 24 and the 7 and 3.7's along to see planets and prominent objects. Neither the 7 or 9 year-olds nor their parents had any difficulty seeing the images (Alberio, Cr 399, pastel bands on Saturn, detail and moons of Jupiter, phase of Venus, M57, M31/32) at any exit pupil or eye relief.
Sometimes I do think we look at eyepiece specs charts and make problems for ourselves.
Edited by havasman, 14 October 2021 - 04:50 PM.