William Optics STC Astro Duo-Narrowband Filter - 48mm

Enhance your astrophotography by reducing light pollution and capturing the most important nebula emission lines with the STC Astro Duo-Narrowband Filter. Designed specifically for urban and suburban night skies, this filter improves contrast and detail while preserving key wavelengths essential for deep-sky imaging.

Product Description

The STC Astro Duo-Narrowband Filter is engineered for astrophotographers seeking to capture detailed images of emission nebulae under light-polluted skies. By selectively transmitting the Hα (656nm) and OIII (500nm) wavelengths, this filter significantly enhances contrast and reveals fine structural details in gaseous and planetary nebulae.

Its professional-grade Ion Beam-Assisted Deposition and advanced anti-reflective coatings are applied to premium Schott optical glass, ensuring long-lasting durability and exceptional optical performance. The robust, flare-resistant frame design provides both reliability and ease of use in the field.

Key Features

• Dual Narrowband Transmission
  Precisely enhances the Hα (656nm) and OIII (500nm) emission lines for improved capture of gaseous and planetary nebulae.
• Effective Light Pollution Reduction
  Minimizes interference from artificial city lighting while blocking unwanted longer wavelengths.
• Advanced IBAD Coating Technology
  Ion Beam-Assisted Deposition (IBAD) ensures superior durability, stable spectral performance, and resistance to aging caused by temperature and humidity changes.
• Premium Optical Glass
  Constructed from high-quality Schott optical glass for excellent clarity and image sharpness.
• AR Multi-Coating
  Anti-reflective coating enhances light transmission and image quality.
• Durable Frame Design
  Matte black anodized, Teflon-coated frame reduces flare and allows easy installation and removal.