BAADER CMOS SHO NARROWBAND FILTER SET
Baader Planetarium
BAADER CMOS SHO NARROWBAND FILTER SET - 1¼" / 3.5/4nm is backordered and will ship as soon as it is back in stock.
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
- 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
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!
Specifications
| Transmission range |
H-alpha, O-III, S-II |
|---|---|
| Central wavelength |
H-a - 656.3 nm, O-III - 500.7 nm, S-II - 671.7 nm |
| Half bandwidth (3.5-4 nm) | H-a - 3.5 nm, O-III & S-II - 4 nm |
| Half bandwidth (6.5 nm) | H-a, O-III & S-II - 6.5 nm |
| Suitable for f/ratio | > f/3.4 |
| AR-coating |
Reflex-Blocker hard coated, planeoptically polished |
| Filter thickness 1.25", 2", 31 mm, 36 mm | 2 mm (without cell), 6 mm with cell |
| Filter thickness 50.4 mm, 50 x 50 mm, 65 x 65 mm | 3 mm |
| Filter size | 1.25", 31 mm, 36 mm, 2", 50.4 mm round, 50 x 50 mm square, 65 x 65 mm square |
