Daystar ERF 100mm with 140mm Cap - E-140N100 Dew Shields By Size_14” We recommend use of red

We recommend use of red

5Å PE Hydrogen Alpha

the etalon will be approximately 0

Includes one each Q34XGF and Q34X2D2

Daystar ERF 100mm with 140mm Cap - E-140N100 Dew Shields By Size_14” We recommend use of red100mm ERF Glass, Cell & 140mm 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