Baader Planetarium F/2 Sulfur-II High-speed Narrowband Filter, 50mm Square, Unmounted

Discover the transformative power of the Baader S-II High-speed f/2 Narrowband Filter, an innovative solution for astrophotography enthusiasts. This high-quality, unmounted, 50mm square filter is specifically designed for use in fast optical systems, including renowned models like Celestron's Rowe-Ackermann Schmidt Astrograph (RASA) and Starizona's Hyperstar systems.

Unlike conventional narrowband filters, which often result in significant transmission loss due to the strong center wavelength (CWL) shift, this Baader S-II filter features a unique CWL-preshift. This innovative design perfectly matches f/2 to f/3 optics, ensuring optimal performance even in very fast optical systems where the CWL may shift out of the filter's full width half maximum (FWHM) transmission.

Despite the typical line broadening associated with fast optical trains, this versatile filter delivers maximum contrast, making it an essential tool for high contrast emission nebulae imaging. Experience a dramatic improvement in your astrophotography when using this filter between f/1.8 and f/3.5, compared to regular sets of narrowband filters.

Crafted by Baader Planetarium, a brand synonymous with durability and quality, this colorful S-II filter is a game-changer for astrophotography, offering unparalleled flexibility and performance.