I have a 3.1" MA Newtonian secondary from Nova Optical. It is coated with the highest transmission Endurobright coatings (98% reflectivity)... extremely durable multi-dielectric coating. It is New in the original box... NEVER OPENED. I actually bought this a few years ago for an ATM project that I never finished. Cost me well over $200... yours for $180.00 shipped.