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375" x 24 threads and female 1
Cell & 200mm ID Cap - For Refractors
Accepts GM1D1 1
Cell & 150mm ID Cap - For Refractors
Dave Ek Box
Daystar ERF 130mm with 190mm Cap - E-190N130 Nikon 375" x 24 threads and130mm ERF Glass, Cell & 190mm 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
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