DayStar Energy Rejection Filters.

DayStar Energy Rejection Filters.

For Use With Your T-Scanner Or Quantum Hydrogen Alpha Filter.
 

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 entering the filter.

DayStar filter assemblies operate best at f/30 and slower. Creating f/30 configuration can be
done easily with the proper ERF and/or barlow lens. Higher resolution, larger aperture
configurations use a barlow.We will be happy to advise on which combination of ERF and barlow is suitable for your telescope.

160mm ERF Glass, Cell & Cap, Clear Aperture 165mm
150mm ERF Glass, Cell & Cap, Clear Aperture 150mm
127mm ERF Glass, Cell & Cap, Clear Aperture 127mm
114mm ERF Glass, Cell & Cap, Clear Aperture 114mm
101mm ERF Glass, Cell & Cap, Clear Aperture 101mm
90mm ERF Glass, Cell & Cap, Clear Aperture 90mm
80mm ERF Glass, Cell & Cap, Clear Aperture 80mm
70mm ERF Glass, Cell & Cap, Clear Aperture 70mm
63mm ERF Glass, Cell & Cap, Clear Aperture 63mm
50mm ERF Glass, Cell & Cap, Clear Aperture 80mm
38mm ERF Glass, Cell & Cap, Clear Aperture 38mm
25mm ERF Glass, Cell & Cap, Clear Aperture 25mm