DayStar Energy Rejection Filters.

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.

Prices:
160mm ERF Glass, Cell & Cap, Clear Aperture 165mm - £678.00
150mm ERF Glass, Cell & Cap, Clear Aperture 150mm - £611.00
127mm ERF Glass, Cell & Cap, Clear Aperture 127mm - £509.00
114mm ERF Glass, Cell & Cap, Clear Aperture 114mm - £372.00
101mm ERF Glass, Cell & Cap, Clear Aperture 101mm - £342.00
90mm ERF Glass, Cell & Cap, Clear Aperture 90mm - £306.00
80mm ERF Glass, Cell & Cap, Clear Aperture 80mm - £271.00
70mm ERF Glass, Cell & Cap, Clear Aperture 70mm - £255.00
63mm ERF Glass, Cell & Cap, Clear Aperture 63mm - £239.00
50mm ERF Glass, Cell & Cap, Clear Aperture 80mm - £169.00
38mm ERF Glass, Cell & Cap, Clear Aperture 38mm - £136.00
25mm ERF Glass, Cell & Cap, Clear Aperture 25mm - £102.00

All plus shipping & insurance.

The Astronomy Shop

1 Tone Hill. Wellington

Somerset TA21 0AU

United Kingdom

Telephone: +44 (0)1823 665510