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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Player One ERF Filter S-series for Quark Chromosphere – 1.25"
Player One ERF Filter S-series for Quark Chromosphere – 2"
Player One ERF Filter S-series for Quark Chromosphere – 1.25"
Player One ERF Filter S-series for Quark Chromosphere – 2"

Player One ERF Filter S-series for Quark Chromosphere

by Player One
SKU POA-ERF125
$49.00 - $89.00
$49.00
$49.00 - $89.00
$49.00
Price Match Policy!
  • Available in 1.25" and 2" filter sizes
  • Energy Rejection Filter (ERF) for Quark Chromosphere
  • Designed for refractors up to 5" (1.25" version) or 6" (2" version) in aperture
  • High-quality B270 optical glass substrate
  • Multi-layer reflective coatings to prevent heat absorption
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • ERF Filter S-series for Quark Chromosphere

    The Player One ERF Filter S-series is a critical accessory for solar observers using a Quark Chromosphere H-alpha eyepiece on refractors up to 5" (1.25" version) or 6" (2" version) in aperture. Built on a B270 optical glass substrate, its advanced multi-layer coatings reflect harmful solar energy before it reaches the Quark, significantly reducing the heat load on your Quark's sensitive internal components.

    Protect Your Quark: Energy Rejection for Refractors up to 5" or 6"

    A Quark Chromosphere's internal etalon and blocking filters are small. In refractors approaching the aperture limit, the focused solar disk can be larger than these internal filters, concentrating intense heat onto the filter assembly and its housing. The Player One ERF sits ahead of your Quark (the 2" version threads onto the front of your diagonal), rejecting this thermal energy early in the optical path to protect your investment and extend the life of your Quark.

    Reflective B270 Glass and Multi-Layer Coatings

    Unlike simple absorptive filters that can heat up and degrade seeing, this ERF uses a reflective design. The multi-layer coatings are applied to a clear B270 glass substrate, a material known for its excellent optical transmission and stability. This construction ensures that unwanted energy is reflected away from the telescope, not absorbed into the filter glass, so the ERF itself remains cool.

    A Second Role: Enhancing Lunar Imaging

    Beyond its primary solar function, this ERF serves as an effective filter for high-resolution lunar imaging. It can improve atmospheric seeing and boost contrast on lunar features. It provides a brighter image than a typical IR-pass filter like an IR685, allowing for shorter exposures and capturing finer detail along the terminator.

  • Why do I need the Player One ERF with my Quark Chromosphere?

    The Player One ERF is designed to protect the small internal filters inside a Quark Chromosphere from concentrated solar heat. In a refractor, the focused image of the sun can be larger than these filters and heat the Quark's housing and internal components. This filter rejects that energy before it enters the Quark, extending its life.

    Which ERF size do I need for my refractor?

    The 1.25" ERF is intended for refracting telescopes up to 5" (127mm) in aperture, and the 2" ERF for refracting telescopes up to 6" in aperture. Using either on a larger refractor or on any reflector-style telescope (like an SCT or Newtonian) is unsafe and can damage your equipment.

    Does the Player One ERF filter absorb a lot of heat?

    No, it is a reflective filter, not an absorptive one. It uses multi-layer coatings on B270 optical glass to reflect unwanted solar energy back out the front of the telescope. This design prevents the filter itself from heating up and becoming a source of heat in your optical train.

    How does the Player One ERF improve lunar imaging?

    For lunar imaging, the filter acts to improve contrast and can help stabilize atmospheric "seeing." It provides a brighter image than a standard IR685 filter, which allows for shorter exposure times. This helps you freeze moments of steady air to capture finer details on the Moon's surface, particularly along the terminator.

    Can I use this ERF for solar observing without a Quark?

    ABSOLUTELY NOT. This is an energy rejection filter, not a standalone full-aperture solar filter. It must be used in conjunction with a Daystar Quark Chromosphere. Using it alone for any kind of solar observation will cause immediate and permanent eye damage and can destroy your equipment.

    Where do I place the Player One ERF in my optical train?

    For maximum effectiveness, the ERF should be placed as early in the optical path as possible, ahead of your Quark. The most common placement for the 2" version is to thread it onto the 2" nosepiece of your star diagonal. This ensures that the bulk of the solar energy is rejected before it enters the diagonal and reaches your Quark.

  • 1.25"

    Filter Size 1.25"
    Filter Type Energy Rejection Filter (ERF)
    Primary Application Daystar Quark Chromosphere (H-alpha)
    Aperture Limit (Solar) For refractors 5" or smaller
    Substrate B270 Optical Glass
    Coatings Multi-layer reflective coatings
    Secondary Application Lunar Imaging

    2"

    Filter Size 2"
    Primary Application Energy Rejection for Quark Chromosphere
    Telescope Compatibility Refractors up to 6" aperture
    Glass Substrate B270 Optical Glass
    Coating Type Multi-layer composite reflective coating
    Secondary Application Lunar Imaging Enhancement

    • ERF Filter S-series (selected size)

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  • Player One 2-Year Warranty