Pay in 4 interest-free payments of $149.38 Learn more
Ships within 48 hours · Estimated delivery Aug 15 - Aug 20
375" x 24 threads and male drawtube
Comes with felt and three nylon screws
Baffles have been added to increase contrast and AR coatings are optimized for the 656nm wavelength
The Daystar Quark filters perform the best with F/4 - F/9 refractors
Improved Telescope Control
Daystar Off Axis ERF 125mm with 460mm Cap - E-460F125 Drawtube Extension 375" x 24 threads and125mm ERF Glass & 460mm 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
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