Coronado BF15 15mm Solar Blocking Filter

MSRP: $779.99 Please see your local authorized reseller for pricing and availability.

View All Specifications

  • Hydrogen-alpha blocking filter for Coronado primary etalon filters
  • Secondary interference filter for full disc image of the Sun for telescopes up to 1,500mm focal length
  • 1.25" diameter front nozzle, and accepts 1.25" eyepiece and camera nosepieces
  • 15mm clear aperture provides a wider unvignetted field of view compared with the smaller BF10 filter
  • MUST be used in conjunction with a front etalon filter - cannot be used alone
Item #: BF15

Where To Buy?

  • Woodland Hills Camera & Telescopes
  • Orion Telescopes & Binoculars
  • High Point Scientific
  • Mile High Astronomy
  • Agena Astro
  • Khan Scope
  • First Light Optics

The Coronado BF15 15mm 1.25" right angle (diagonal) type Hydrogen-alpha blocking filter is designed to sit behind a SolarMax etalon to provide beautiful H-alpha views of the Sun. This blocking filter is the second element in any Coronado H-alpha system, and is just as crucial to your safety and the system's performance as the primary SolarMax etalon filter. Note this blocking filter CANNOT be used without a SolarMax etalon in front of the telescope front aperture. This secondary interference filter provides a full disc image of the Sun for telescopes up to 1,500mm focal length. Designed to be used with telescopes with a 1.25" focuser opening, and accepts 1.25" eyepieces and camera nosepieces on top. For use on a 2" telescope focuser, consider the #624016 SolarMax III BF15 version.

The BF15 is named because of the 15mm clear aperture window that passes the hydrogen-alpha light to the eyepiece or camera sensor. This 15mm window is wider than the window in the BF10, and thus provides a wider unvignetted field of view around the sun. This will allow wider apparent field of view eyepieces, higher magnification, and larger camera sensors to see an unvignetted view compared with the BF10 version.

Designed and Manufactured in North America.

This product is serviced and supported by its manufacturer according to the terms and conditions included in the packaged product. Orion's limited warranty does not apply. Please contact the manufacturer directly for technical support.

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

User level
Five year