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The advertising blurb says and I quote
The stunning new GT 102 APO is the new jewel of the apochromatic refractor world. From the pristine white finish on the CNC to the elegant gold trim, this beauty has more than just good looks. The new GT 102 features a 3-element objective using high-quality FPL-53 glass and combined with other extra-low dispersion glass that reduces any secondary spectrum to an unbelievable degree.
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Optically unbeatable
Three-element air-spaced primary objective (FPL-53) in adjustable CNC machined ultra high precision lens cell.
Extremely sharp with excellent color correction.
Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces.
This f/6.9 is great for astrophotography.
Enough of the promo stuff .....
I have a William FLT 132 pretty much same optics... Triplet APO , and I have zero problems with halos from the scope, that being the blue halos from your typical acro scopes, any further residual halos around only the brightest stars are from the filters in train at the camera end, an old astronomik Ha and a cheap ir/UV which have now both been replaced.
It's been a good scope
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