[ATM] Ghost image

[Dominic-Luc Webb]

Is it really a ghost, or could it be stray light, particularly
from misaligned optics?  Does it chance position when you
move the brightest object in the field from left to right part
of field? I have seen such things when looking at very bright
objects like Venus. A strong aperture stop helped (like only
15-25 mm hole). I actually use 15-25 mm aperture stop to
view Saturn and Venus right now, partly to reduce artefacts.

Dominic