SV188P features sophisticated, Multi-layered dielectric coatings that provide an astounding 99% reflectivity for maximum view brightness and sharpness. Dielectric mirror coatings are more durable and more reflective than enhanced aluminum coatings Brass lock Screw for eyepiece or adapter and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching. 1.25" nosepiece barrel is threaded to accept 1.25-Inch eyepiece and filters Diagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope Machined and anodized aluminum housing features machine-threaded baffles for optimized contrast.
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