Hi all,
I brought this scope around last October and only took it out twice. First time was just after lockdown in April. That time I did not use it as it was cloudy.
Second time was few days ago.
Anyway I thought I would look at the thin crescent moon and was surprised to see a yellow tinge around the moon and around the edge of the 31mm Tele Vue nagler 82º eyepieces.
With Jupiter there was a horrible red tinge to the bottom of the disc and had a general false colour around it. I thought perhaps it was because it was low down in the sky.
The stars looked ok but I thought M13 looked a bit dim.
I did not take any other eyepieces with me.
Today I Noticed that the primary mirror had like a mist, film layer on the surface with a little cleaner area on the edge. I left it about a hour just to make sure it was not reacting to different air temperature.
I pointed the scope to the sky and again the yellow tinge around the eyepiece. I tried another 1.25 25mm eyepiece and that was fine.
Next I borrowed another 2" Explore Scientific 100° eyepiece from my friend and the same yellow tinge around the eyepiece was there.
I am tempted to clean the mirror but I'm not sure that will do anything.
Any ideas would be welcome.