Just thought I would share my experience when observing the moon on 2nd July, after a long spell of inclement weather, the skies cleared and Luna beckoned. The seeing was quite good at times, I managed some nice images (will post some) and decided I would try out an old Kellner eyepiece that I have had for decades, (truthfully forgot about).
I had used some plossels and sky watch panorama eyepieces before curiosity got the better of me after finding the Kellner.
I was amazed at the crisp, colour free and detailed image I was looking at. (I was using my OMC200 F20 Maksutov). I will definitely be using this eyepiece again!
Anyway, just thought I would give credit where credit is due, as regards, I suspect undervalued and neglected occulars. Keep well. Larry