There are some eyepieces which have little or no ghosting.
IIRC, these include Orthoscopics and Kellners (MA's ?)
because they have relatively few elements, few air-glass
surfaces, and the facing air-glass surfaces are all convex.

Actually, the classical Kellner has the field lens at the focus of the
eye lens, and you can get really strong ghosts that way, though
not a series of them if the elements are aligned properly. I
seem to recall that some problems with one's eyes can cause
these "ghosts", but cannot confirm that. I do know that I was
seeing ghost images of bright lights until I got my eyeglass
prescription updated. Perhaps it is astigmatism??

Hope this will help. By the way, though they do have a strong
reflection, Kellners can be a very good EP if well made and
properly coated. I recall seeing M57 as a globe with Plossls
and even Orthos, but clearly seeing it as a ring with a Kellner.


Clear, Dark, Steady Skies!
(And considerate neighbors!!!)