Coronado BF-5 5mm Solar Blocking Filter

MSRP: $429.99 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 500mm focal length
  • 1.25" diameter front nozzle, and accepts 1.25" eyepiece and camera nosepieces
  • 5mm clear aperture
  • MUST be used in conjunction with a front etalon filter - cannot be used alone
Item #: BF5

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 BF5 5mm 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 500mm focal length. The BF5 is named because of the 5mm clear aperture window that passes the hydrogen-alpha light to the eyepiece or camera sensor.

Designed to be used with telescopes with a 1.25" focuser opening, and accepts 1.25" eyepieces and camera nosepieces on top. Can be used on a 2" focuser with a step down adapter, but for a larger clear aperture and native 2" front nosepiece, consider the #624015 SolarMax III BF10 version.

Designed and Manufactured in North America.

Limited Warranty against defects in materials or workmanship for two years from date of purchase. This warranty is provided by Meade for the benefit of the original retail purchaser only. For complete warranty details contact Meade at 800-626-3233.

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
T-max tuner
Two year