Astronomy Specialist

BAADER CMOS S-II F/2 ULTRA-HIGHSPEED FILTER

$242.00 USD
SKU: BA2961525

Baader Planetarium

  • 4 nm


Size
Bandpass

 

The new Baader CMOS-optimized S-II 4nm / 6.5nm Highspeed F/2 filter is a precision-grade narrowband filter with a high transmission at the Sulphur-II line at 671.7nm. 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

 

Transmission range
S-II
Central wavelength
671.7 nm
Half bandwidth 4 nm / 6.5 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

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BAADER CMOS S-II 4nm F/2 ULTRA-HIGHSPEED FILTER.

BAADER CMOS S-II F/2 ULTRA-HIGHSPEED FILTER

From $145.00 USD

Size

  • 1¼"
  • 31mm
  • 36mm
  • 2"
  • 47.4mm
  • 50.4mm
  • 50mmx50mm
  • 65mmx65mm

Bandpass

  • 4nm
  • 6.5nm

Optical design

Image circle

Focal ratio

Aperture

Focal length

Optical thickness

Threads

Cooled

Colour or Mono

Pixel size

Sensor dimensions

Resolution

Sensor diagonal

Quantum efficiency

Read noise

Fullwell capacity

Bit depth

FPS

Camera backfocus

Filter size

1.25", 2", 31 mm, 36 mm, 47.4 mm, 50 mm round, 50 mm x 50 mm square, 65 mm x 65 mm square

Filter size

1.25", 2", 31 mm, 36 mm, 47.4 mm, 50 mm round, 50 mm x 50 mm square, 65 mm x 65 mm square

Bandpass (FWHM)

4 nm

Bandpass (FWHM)

4 nm

Glass thickness

2 mm, 3 mm

Mount type

Payload capacity

Latitude range

Dovetail saddle

Slew speed

Encoders

Periodic error correction

Counterweight shaft

Azimuth adjustment range

Internal diameter

Illuminated diameter

Compatible telescope external diameter

Weight

Length

Width

Height

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