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DayStar Filters 115mm-Aperture Off-Axis Energy Rejection Filter

SKU : DF-E-410F115

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  • For solar use only.
  • Do not ever point your telescope at the sun without proper solar protection.

Product Details

  • Daystar Filters' 115mm-Aperture Energy Rejection Filteris 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 41.0cm (16.141").

  • specifications

    Filter TypeSolar
  • included items

    • For solar use only.
    • Do not ever point your telescope at the sun without proper solar protection.

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