Product Details

• Description
• Specifications
• Included Items
• Reviews

• The DayStar 75 mm Energy Rejection Filter is for on-axis use with a refractor and/or Maksutov-style telescope OTA. This filter has an outer diameter of 110 mm, fitting around your telescope OTA, while the filter window itself has a diameter of 75 mm.

  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.

• specifications

  Filter Type	Energy Rejection
  Solar Filter	75mm

• included items

  • Keep your equipment optimized and protected during solar applications with this energy rejection filter.
  • Reduces the heat load on your telescope system.
  • Outer diameter: 110 mm
  • Filter diameter: 75 mm
  • Compatible with Refractors and Maksutov-style Telescopes.