[Waxing_Gibbous (Peter)]

My new Takahashi TSA 120 is exhibiting poor behaviour.
There is very slight, yet noticable and annoying CA on Luna in all my EP's (see sig). The fringing is confined to the very limb and does not 'bleed'. Its lessened with narrow-field eyepieces but does not go away.
Luna's "top" is always blue/violet, "bottom" is always green/yellow.
Fringing is independant of height above horizon. Its the same at +20* as it is at +90*.
The same is noticable on Mars.
A Lunar filter eliminates it entirely.
The effect is not evident on brighter stars, but they've been a little washed-out lately with the full moon. Star tests are ,AFAICT, near perfect.
Contrast and deatil are incredible.
This is the first decent-sized triplet I've owned, and I know they are not immune to CF/CA, but does this sound 'normal' for this scope. I would prefer that its colour correction not depend on a $10 piece of glass.
I don't recall any fringing in the TEC/WO 110 or SV 105 that I viewed with earlier this year.
Thoughts?
Ta.
Peter