Daystar ERF 100mm with 120mm Cap - E-120N100 Half Edited Dave Ek Box

Dave Ek Box

Focus and clearances not guaranteed for 100% of Nikon style lenses

Starry Night Pro provides a full-immersion into the wonders of the universe

Best performance with F/15 - F/30 refractors full aperture

The ERF can also serve as an aperture mask to accomplish a straight angle of incidence for light entering the filter

Daystar ERF 100mm with 120mm Cap - E-120N100 Half Edited Dave Ek Box100mm ERF Glass, Cell & 120mm ID Cap For Refractors 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 light