In article ,
Wayne Watson wrote:

Viewing Mars with the Meade 25mm provided eyepiece with the LXD55 AR6 gives
something like two
disks, one brighter than the other. I've seen this before with SCTs and other
scopes.
SNIP_

Wayne,

The only telescope I ever used that showed this ghost image was a 4"
Unitron that I owned for a few years back in the mid 90s. I brought it
to Winter Star Party once, and when Roland Christen looked through it,
he was not surprised. According to Roland, In this case it was due to
surfaces R2 and R3 not being coated, apparently a common occurence in
Unitron objectives. As with you, it was only seen at low powers.
Roland offered to coat the uncoated surfaces but I never took him up on
it. I have no idea what may be causing the ghost image in the scopes
you mention.

Starry Skies,
Rich