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63mm ERF Glass & 244mm Cap - Off Axis For SCT
comprehensive 210-page User's Guide e-book (embedded within the program)
No more ruined sky parties resulting from dew build-up or excess stray light
Includes mounting rings with Vixen dovetail
Updated Model
Daystar Off Axis ERF 90mm with 325mm Cap - E-325F90 Accessories_Wedge Plates 63mm ERF Glass & 244mm90mm ERF Glass & 325mm Cap Off Axis For SCT Daystar Energy Rejection Filters (ERF) reduce the heat load on your filter and optics assembly by absorbing reflecting UltraViolet and or Infrared light while 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
US$ 29.99
US$ 29.99
US$ 27.99
US$ 26.99