I've recently gone thru a Lunatic phase and have really been enjoying learning all of the Lunar features and different landscapes. The moon is a harsh test to put an eyepiece through, but it makes certain effects/defects, such as Rectilinear Distortion & Astigmatism, stand out clear as day. Obviously, some of these eyepieces weren't designed for Lunar viewing but are better suited for deep sky observing [I may touch more on this later].
Anyhow, some of the eyepieces that have performed the best for me have been Pentax XW [5, 7, & 10], Circle T Ortho's [9 & 12.5], and TV Ethos-SX [4.7]. The color rendition of the XW's & Ortho's have been very pure with the Moon having an ash-grey color tone with slight patches bluish-grey & rusty-grey. The Ethos-SX has a slightly warmer color tone, but the level of contrast seems to be higher [possibly due to exit pupil, or could just be better in that category], and it gives me a panoramic view the Moon. In my 130 f/7 apo [using 4.7 Ethos-SX (*edited for clarification)], the entire moon can fit in the field of view at 194x mag.
So what are your favorite eyepiece for Lunar observing? What do you like about them, and what makes them the best for you?
Edited by rkelley8493, 04 April 2020 - 09:18 PM.