Baader 3.5 / 4nm F2 Ultra-Highspeed-Filter-Set 2"
CMOS-optimized (H-alpha / O-III / S-II)
#2961683

The new Baader CMOS-optimized SHO 3.5 / 4nm Highspeed F/2 filters are precision-grade narrowband filters with high transmission at their respective emission lines. 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 3.5 - 4nm bandpass make these ideal for imaging under light-polluted skies.

Baader's CMOS-optimized filters have excellent halo and reflection control. These filters set the new standard for monochrome astrophotography with CMOS sensors.


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 H-a - 3.5 nm, O-III and S-II - 4 nm
• Suitable for f/ratio > f/2.3
• 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
• SKU 1.25" BA2961680
• SKU 31 mm BA2961681
• SKU 36 mm BA2961682
• SKU 2" BA2961683
• SKU 50.4 mm round BA2961684
• SKU 50 x 50 mm BA2961685
• SKU 65 x 65 mm BA2961686

$1595

2 year Manufacturer's warranty

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