The new Baader CMOS-optimized H-alpha 3.5nm / 6.5nm Highspeed F/2 filter is a precision-grade narrowband filter with a high transmission at the H-alpha line at 656.3nm. 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 3.5nm 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
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Very high contrast due to steep edges of the coating
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Reflex-Blocker coatings to minimize reflections caused by correctors, reducers and other optical elements
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Standardized thickness for maximum possible parfocality - less need to refocus due to different filter thicknesses
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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
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Life-Coat for hardness and age-resistance, making the filters able to withstand tougher conditions for longer
Warning: Imaging H-alpha filters are different from solar H-alpha filters and cannot be used for this purpose. Doing so may cause damage to your equipment and eyesight!
For more information on Baader's new generation of CMOS-optimized filters, check out this blog post!