DayStar Filters 80mm-Aperture Off-Axis Energy Rejection Filter (311mm Cap Diameter)

DayStar Filters 80mm-Aperture Off-Axis Energy Rejection Filter (311mm Cap Diameter)

DayStar Filters 80mm-Aperture Off-Axis Energy Rejection Filter (311mm Cap Diameter)

B&H # DAE311F80 MFR # E-311F80
DayStar Filters 80mm-Aperture Off-Axis Energy Rejection Filter (311mm Cap Diameter)

DayStar Filters 80mm-Aperture Off-Axis Energy Rejection Filter (311mm Cap Diameter)

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Expected availability: 7-14 business days

Product Highlights

  • For Use on Schmidt-Cassegrain OTAs
  • Reduces Heat Load on Filter Assembly
  • Absorbs or Reflects UV and/or IR Light
  • For H-alpha, Sodium, Helium D3 Filters
  • Cap Inside Diameter: 31.1cm (12.244")
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SAFETY FIRST: Observing the Sun without the proper protection may result in serious personal injury, including permanent eye damage and blindness, and/or damage to equipment. Never point an optic at the sun without an approved solar filter on the front of the optic. For direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder, ensure your filter is ISO 12312-2 (also written as ISO 12312-2:2015) certified. Never use photographic neutral density filters for direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder.

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  • 1Description

Daystar Filters' 80mm-Aperture Energy Rejection Filter is designed for on-axis use with larger Schmidt-Cassegrain style OTAs to reduce the heat load on the internal components within the optical path, as well as your filter assembly, by absorbing or reflecting UV and/or IR light while transmitting light in the desired spectrum. This ERF can be used with H-alpha, Sodium, and Helium D3 solar filters, but is incompatible with calcium wavelengths.

Choose the ERF aperture size to approximately match your OTAs front lens. Select the correct filter cap size by measuring the outside diameter of the OTA's front retaining ring, including fastener heads, and choose the ERF with the smallest inside diameter that will fit over the end. A set of screws is included to secure the ERF into place. This ERF's cap has an inside diameter of 31.1cm (12.244").

UPC: 724696425649
In the Box
DayStar Filters 80mm-Aperture Off-Axis Energy Rejection Filter (311mm Cap Diameter)
  • 3 x Set Screws
  • Limited 10-Year Warranty
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