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The CAMERA QUARK snaps on between your Nikon type telephoto lens and your camera
and city night lights on dark side (Earth only)
Great question
ERFs are custom machined on a one-off basis and so the accuracy of this measurement is very important
No more ruined sky parties resulting from dew build-up or excess stray light
Daystar Off Axis ERF 90mm with 325mm Cap - E-325F90 Accessories_Wedge Plates The CAMERA QUARK snaps on90mm 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
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