Daystar ERF 140mm with 170mm Cap - E-170N140 Accessories_Front Plates Cell & 140mm ID Cap

Cell & 140mm ID Cap - For Refractors

Full disk viewing possible on lenses up to ~450mm focal length lenses

Fully integrated DayStar filtration with classic DayStar Quantum control

try full tilt in the opposite direction

Bisque Paramount + TheSkyX

Daystar ERF 140mm with 170mm Cap - E-170N140 Accessories_Front Plates Cell & 140mm ID Cap140mm ERF Glass, Cell & 170mm ID Cap For Refractors Discontinued 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