|
Anything actually. It shows up even holding the eyepiece on its own and looking through it. If you hold it and look down the tube, there seems to me to be a pattern of multiple rainbows at the front and the back ends of the eyepiece - as if there was a defect on more than one optical element. The artifact does not occur only when the eyepiece is in the scope but it is there as well.
I am begining to wonder of someone (previous owner) hasn't perhaps used a cleaning agent of somer description on this and damaged the coatings.
|