Daystar Off Axis ERF 80mm with 311mm Cap - E-311F80 Half Edited For use on F/7 or

For use on F/7 or longer focal ratio refractors

Quanum Calcium II H 5Å PE: 3-4 weeks

Cell & 200mm ID Cap - For Refractors

deep sky objects and

Daystar Off Axis ERF 80mm with 311mm Cap - E-311F80 Half Edited For use on F/7 or80mm ERF Glass & 311mm Cap Off Axis For SCT Daystar Energy Rejection Filters (ERF) reduce the heat load on your filter and optics assembly by absorbing reflecting UltraViolet and or Infrared light while 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