BAADER CMOS O-III F/2 ULTRA-HIGHSPEED FILTER

The new Baader CMOS-optimized O-III 4nm / 6.5nm Highspeed F/2 filter is a precision-grade narrowband filter with a high transmission at the Oxygen-III line at 500.7nm. The Highspeed F/2 versions are specifically designed to work very well with modern highly-sensitive astronomy cameras and telescopes with extremely fast focal ratios faster than f/2.3 such as the Celestron RASA astrographs. 

The ultra-narrow 4nm bandpass makes this ideal for imaging under light-polluted skies. The 6.5nm versions are recommended for most cases where there is not a great deal of light pollution.

Baader's CMOS-optimized filters have excellent halo and reflection control, increased contrast and even more narrow passbands than previous generations. These filters set the new standard for monochrome astrophotography with CMOS sensors.

A special 47.4mm size is available for use with Baader's FCCT Filter Changer Camera Tilter for the Celestron RASA 8" and QHY cameras.

Baader CMOS-optimized filters - advantages

• Very high contrast due to steep edges of the coating
• Reflex-Blocker coatings to minimize reflections caused by correctors, reducers and other optical elements
• Standardized thickness for maximum possible parfocality - less need to refocus due to different filter thicknesses
• Blackened edges with side markings in the form of a black outer rim on the telescope side
• Each filter is individually fine-polished and coated with sealed coating edge, preventing moisture ingress
• Life-Coat for hardness and age-resistance, making the filters able to withstand tougher conditions for longer

For more information on Baader's new generation of CMOS-optimized filters, check out this blog post!