Baader Filters OIII CMOS f/2 Highspeed 1.25″

The Baader Filters OIII CMOS f/2 Highspeed 1.25″ is designed specifically for modern astro cameras with CMOS sensors and fast optics. Tuned to a central wavelength of 500.7 nm (OIII line), the filter compensates for the light cone shift that occurs at telescopes with an aperture ratio of up to f/2.

As a result, the filter achieves maximum transmission of oxygen emissions in planetary nebulae, supernova remnants and emission nebulae, while drastically reducing light pollution and background noise. The Baader hard coating technology ensures a stable transmission profile, even in fast systems, and prevents reflections or halos.

Application:
Perfect for astrophotography with fast telescopes (RASA, HyperStar, Epsilon, Celestron Rowe-Ackermann). Ideal for:

• Emission nebulae (OIII) such as the Veil Nebula
• Planetary Nebulae (e.g., M27 Dumbbell)
• Supernova remnants and narrowband projects

Specifications:
Filter type: OIII narrowband (CMOS f/2 Highspeed)
Central wavelength: 500.7 nm
Bandwidth (FWHM): approx. 6.5 nm
Transmission:>90%
Barrel size: 1.25″
Coating: Hard coating, anti-reflection
Compatibility: CMOS sensors, f/2 optics
Country of origin: Germany