I was testing several 2” eyepieces in an 8” f/5 reflector (no optical correction).
These included a Meade series 5000 24mm UWA vs a Televue 26mm Nagler.
Both eyepieces are stored in eyepiece plastic bolt cases with both after market “yellow” upper and lower end-caps. I always put the original end-caps in the original boxes (if I have them) for safe keeping. If I decide to move the eyepiece to a new home, I have the original caps/box.
The eyepieces are stored vertically.
The view in the Televue 26mm was excellent - nice pinpoint images.
I inserted the Meade 24mm UWA and the views just looked strange. Some areas were excellent and other areas looked faded/mushy. I rotated the eyepiece and different areas were in focus and others mushy.
It could’ve been eye fatigue but the great view in the Nagler ruled that out.
Maybe some dew condensation on the upper eyelens - a quick check with a red flash light ruled that out.
I took the eyepiece out of the focuser to inspect the other end. There was a large 1/2” “smudge” mark in the centre. The lower lens is very close to edge of the eyepiece barrel. The “soft” lower end-cap was pushed upward touching the lower lens. A quick thorough cleaning with ROR brought the view back to normal. A very nice view but the TV 26mm Nagler was definitely more impressive.
The TV Nagler lower lens is more recessed and the soft yellow endcap could never touch the lower lens.
I make the case that Televue has the better “solid” eyepiece end-caps. They fit nicely with the rubber eye cap in the upper or recessed position. I do like the yellow colour of the softer after market versions (easily found in the dark as compared to the black original versions). Maybe Televue and others should offer “optional” solid yellow colour eyepiece end-caps.
Just throwing that idea out there.
Any opinions ?