Name: Baader Planetarium 31mm Round f/2 High-speed H-alpha Filter, Unmounted
Brand: Baader Planetarium
SKU: AAFHALHSRD31
Price: 209.00 USD
Availability: BackOrder
Rating: 5 (1 reviews)

Baader Planetarium 31mm Round f/2 High-speed H-alpha Filter, Unmounted

Baader Planetarium Filter

Baader Planetarium

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Generally ships in 7-14 days, subject to availability

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Generally ships in 7-14 days, subject to availability Estimated to Ship: 07/24/2025.

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Optics & Binoculars

Telescopes & Astronomy

Telescope Filters

Baader Planetarium Telescope Filters

Baader Planetarium Filter 

Explore the Baader Planetarium 31mm H-alpha filter for high-speed astrographs. Maximize contrast with this narrowband filter. Shop now for superior image quality.

Discover the transformative power of the 31mm Round f/2 High-speed H-alpha Filter, unmounted, a high-quality and innovative product from the reputable Baader Planetarium. This durable and reliable filter is specifically engineered for the specialized requirements of ultra-fast astrograph optics, including Hyperstar and RASA systems. Unlike conventional narrowband filters that often result in significant transmission loss due to the strong Central Wavelength (CWL) shift, this high-speed H-alpha filter is designed with a CWL-preshift that perfectly aligns with f/2 to f/3 optics. This unique feature ensures that even in extreme cases, the CWL does not shift out of the Full Width at Half Maximum (FWHM), thereby optimizing the FWHM and delivering maximum contrast.This effective filter is a game-changer in the field of astrophotography, particularly for high contrast emission nebulae imaging. It is optimized for use with fast optics between f/1.8 and f/3.5, offering a dramatic improvement over regular sets of narrowband filters. Experience the night sky like never before with this innovative filter, designed to capture the hydrogen-alpha emission line in the sun's spectrum with unparalleled clarity and contrast. Whether you're a seasoned astrophotographer or a beginner in the field, the 31mm Round f/2 High-speed H-alpha Filter, unmounted, is a must-have addition to your astrophotography equipment.

AstroSolar film is the standard for white light solar filters. This mounting cell has two great advantages for eclipse photographers. 

The wide flange shades your camera avoiding overheating. 

The external 3 rubber bumper attachment is easy to remove and replace quickly without disturbing your aim. This is a great advantage for totality in a total solar eclipse. 

Highly recommended

Baader Planetarium 31mm Round f/2 High-speed H-alpha Filter, Unmounted

Key Features

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