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Long eye-relief eyepieces listed below.
If you wear specs the Vixen LV and LVW series both have lot of eye-relief across the whole range and also have a nice soft rubber eyecup that won't scratch spec's (if you wear them to observe, as I do). Some of the others listed below don't, so if this matters to you it is advisable to check.
1. The original Vixen LV series had 20mm eye relief, focal lengths from 2.5 to 25mm were in 1.25" barrels, then two very big ones - 30mm and 50mm both in 2" barrels. These went out of production long ago and very hard to find secondhand but see NLV below. Excellent eyepieces though outgunned by the ultra-wides that seem to be more popular.
Vixen also made a very nice zoom eyepiece based on the LV design in a 1.25" barrel with similar long eye relief, a bargain if you find one.
2. The Vixen LVW series have 20mm eye relief, and are still available; from 5mm to 22mm in dual 2"/1.25" barrel; then 30mm and 42 mm in 2" barrels.
3. Vixens NLV series, 1.25" barrels, optically the same as the LV series upto 25mm focal length in a different barrel style with a hard plastic eyecup, and currently available. The downside is the big fat fugly eyecups.
3. Televue Radian - 20mm eyerelief.
4. Televue Panoptic - eye relief ranges from a useable 13mm to 27mm depending on the eyepiece focal length. The 19mm and 24mm are in 1.25" barrels, the rest 2".
5. Televue Delos - 20mm eyerelief (all). 3.5-17mm focal lengths, all in 1.25" barrels.
6. Pentax XF - 18mm eyerelief, 1.25" barrels.
7. Pentax XW - 20mm eyerelief, dual 2"/1.25" barrels.
Note the Pentax XO series have very short eye relief.
8. Baader Hyperion range. A somewhat inferior copy of the Vixen LVW series, which doesn't perform so well in fast scopes.
9. The Edmund RKE 21mm and 28mm deserve a mention; both with long eye relief though the 21mm has a raised metal ring around the eye lens that basically defeats the whole point of eye relief, and is a menace if you wear specs (they will get scratched).
There are some other obsolete ones too, notably Vixen LV's rebadged by Celestron and others. Then there are the cheap chinese clones... I don't have consistent specifications for these, though i am sure some will be reasonably OK as budget eyepieces.
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