Baader O-III 2" (6.5nm) CMOS Filter

The Baader O-III Narrowband Filter (6.5nm) is a precision-grade filter optimized for CMOS sensors, designed to enhance deep sky astrophotography by isolating the O-III emission line at 500.7 nm. Featuring a narrow 6.5 nm full width at half maximum (FWHM), this filter allows for high contrast imaging of nebulae and other celestial objects.

Constructed with Reflex-Blocker™ hard coating and plane-optically polished surfaces, the filter ensures minimal reflections and maximum transmission. The Life-Coat™ technology provides a durable, aging-resistant coating suitable for demanding observational environments.

This filter is mounted in a sturdy LPFC 6mm frame, compatible with 1.25" and 2" filter threads, making it easy to integrate into various astrophotography setups. Its blackened edges and lead-side indicator reduce stray light and reflections, improving image quality.

Ideal for use with CMOS and CCD cameras, the Baader O-III Narrowband Filter is a valuable tool for astrophotographers seeking to capture detailed and high-contrast images of emission nebulae and other deep sky objects.