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Cell & 200mm ID Cap - For Refractors
375" x 24 threads and male drawtube
Thread: Male/Female 'T' thread
A new layer of over 100 interactive
Celestron NexStar 5i/8i
Daystar ERF 80mm with 110mm Cap - E-110N80 F-Ratio_F/6 - F/8.9 Cell & 200mm ID Cap80mm ERF Glass, Cell & 110mm ID Cap For Refractors DayStar Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and or I light and transmitting light in the desired visual spectrum. These filters are sometimes Red or Yellow glass, or dielectric IR and UV, but pass light in the desired visual spectrum. The ERF can also serve as an aperture mask to accomplish a straight angle of incidence for light entering