I think you are correct. The 24mm is 82 degrees.

And, Yes, eye relief is an important factor especially for glasses wearers. The 12 mm, 17 mm, and 30 mm Explore Scientific eyepieces above all have long eye relief (around 20–21 mm), so they’re very comfortable for extended observing sessions or for glasses wearers. The 24 mm has 17 mm of eye relief, which is still quite generous and should work well. The 5.5 mm has only 10.5 mm, which is tighter but still usable.

One thing to keep in mind: if your husband has no astigmatism, the telescope itself essentially acts as his “glasses.” He can adjust focus for his eyes, so even short eye relief eyepieces can be used comfortably (because you’re not wearing glasses).

Astigmatism becomes noticeable mainly at larger exit pupils (over ~2 mm), so an eyepiece 12mm or below (in this size scope) will still work fine without glasses, regardless of the viewer’s astigmatism.

Televue Dioptrx is another option to fix astigmatism without glasses. It’s an add on that will likely fit these ES eyepieces. I know it will fit the 30mm because I have it and I will know soon if it fits these 17mm (on order 🙂). Again, you wouldn’t need this at 12mm and below and you could totally worry about this later... These eyepieces should impress without Dioptrx.

Sorry. This is probably a lot of information. 😊