ZWO 2" Duo-Band Filter

The ZWO 2″ Duo-Band Filter is a specialized narrow-band filter designed for deep-sky astrophotography under light-polluted conditions. This filter is a game-changer for photographers using one-shot color (OSC) cameras, as it simultaneously passes two key emission lines from nebulae: H-alpha (656.3 nm) and Oxygen III (500.7 nm). By rejecting a wide range of unwanted light from artificial sources like streetlights, it dramatically enhances the contrast and signal of nebulae, allowing you to capture vibrant, detailed images from urban or suburban environments. Its 2-inch size is ideal for larger sensors, ensuring no vignetting occurs in your images. The filter's high-quality glass and coatings provide excellent transmission and durability.

• Thread Size: 2″ (M48)
• Passbands: H-alpha (656.3 nm) and O-III (500.7 nm)
• FWHM: H-alpha: 15 nm, O-III: 15 nm
• Substrate Material: Schott glass
• Coatings: Multi-layer anti-reflection coatings
• Primary Use: Light pollution rejection for emission nebulae
• Compatibility: One-shot color cameras and monochrome cameras with 2″ filter threads

• ZWO 2″ Duo-Band Filter
• Protective Plastic Case