Rainbow in my objective?

Hi all. I am not an expert on objective lenses.
I purchased this scope (AP155EDF) almost a year ago and noticed this just now. The color rings can only be seen under certain angles to the lens. I did not notice it before becouse there was no reason to look for trouble, since I thought the scope performance is superb. Now I am wondering if this is a flaw caused by a pinched lens by some previous owner trying to collimate it. I am worried that I am not getting 100% from this scope. The scope was hand exchanged from the previous owner, it was handled very carefully by me all this time and the lens never adjusted by me. Please comment and offer help.
Thanks; Kaz.
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AP155/AP900GTO

Attached Image:

Send it in and we'll take a look at it (contact [email protected]).

Roland Christen

This is normal. It is a Newton's Rings pattern in the oil
space caused by multilple reflections between the R4 and R5
surfaces. All refractors with thin spaces will show something
similar, but you need the light and angles just right for it
to appear.

Kaz:

Of course if you are still concerned, I'll gladly relieve you of the "problem" for a fair price.

Jeff