Is 3 lenses elements in 2 groups always a Kellner?
So here a pic of the Sarblue Mak 20mm ep that came with the scope, it very comfortable and clear, eventhough it say 50 deg, but it seem bigger than that when view inside, I thought it was 60 deg.
There a video of a man in Youtube he disassemble this ep then put it back together, he said it 3 lenses elements in 2 groups. He didn't; say it if it a Kellner, Reversed Kellner or Modified Achromat
This is an eyepiece that I will never let go, it just so comfortable to look through. What exactly is this thing? It looks plastic but it actually glass in there, 3 elements 2 groups.