The new Baader CMOS-optimized SHO 3.5 / 4nm & 6.5nm filters are precision-grade ultra-narrowband filters with high transmission at their respective emission lines. They are designed to work very well with modern highly-sensitive astronomy cameras and telescopes with focal ratios between f/15 to f/3.4.
The ultra-narrow 3.5 - 4nm bandpass make these 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. These filters set the new standard for monochrome astrophotography with CMOS sensors.
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!