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Meade ETX 90-125
Argon atoms are “ larger” than that of Nitrogen and therefore they are less likely to “leak” or diffuse their way through the seals over the life of the eyepiece
Location Markers and Surface Feature Outlines
we do recommend using a field flattener
SKU: FW-05SHa-04SNa-2CaK
Explore Scientific 2" Diagonal Mount Type_Dobsonian Meade ETX 90-125Explore Scientific 2" 99% Reflectivity Diagonal Introducing this High quality and functional 2" 99% Reflectivity Diagonal by Explore Scientific. This comes complete with 1. 25 inch Adapter and dust covers. Solid and lightweight, this first surface coated diagonal mirror reflects 99% of the light to help keep the brightest possible telescope's image. The insert barrel is a double taper so that it can be smoothly added or withdrawn from the focuser. The