Astronomy Specialist

BAADER CMOS H-ALPHA NARROWBAND FILTER

$260.00 USD
SKU: BA2961325

Baader Planetarium

  • 3.5 nm


Size
Bandpass

 

The new Baader CMOS-optimized H-alpha 3.5nm / 6.5nm filter is a precision-grade ultra-narrowband filter with a high transmission at the H-alpha line at 656.3nm. It is 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 3.5nm bandpass make these ideal for imaging under light-polluted skiesThe 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.

 

 

 

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

 

Transmission range
H-alpha
Central wavelength
656.3 nm
Half bandwidth 3.5 nm / 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

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BAADER CMOS H-ALPHA 3.5 nm ULTRA-NARROWBAND FILTER.

BAADER CMOS H-ALPHA NARROWBAND FILTER

From $139.00 USD

Size

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

Bandpass

  • 3.5nm
  • 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, 50 mm round, 50 mm x 50 mm square, 65 mm x 65 mm square

Filter size

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

Bandpass (FWHM)

3.5 nm

Bandpass (FWHM)

3.5 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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