Astronomy Specialist

BAADER C2 SWAN-BAND FILTER FOR COMETS

$79.00 USD
SKU: BA2961860

Baader Planetarium


Size

 

The Baader C2 Swan-band filter isolates the two diatomic carbon lines at 511 & 514nm, which dominate the spectrum of a comet's gas tail and plume, respectively. Unlike other Swan-band filters on the market, this filter completely blocks the OIII line at 501nm and below.

The C2 filter has a central wavelength of 512nm with a half-width of ≤15nm. This makes it useful not only for cometary imaging, but as an OIII parallel filter to better remove stars from images, as well as a solar filter in a previously inaccessible part of the spectrum (only with the appropriate energy rejection filter!).

Available in either 1.25" or 2" mounted. The filter cell is threaded on both ends so that multiple filters can be stacked. All Baader filters (excluding 100 x 100mm) come in stackable labelled filter boxes which can be attached to each other to form a sturdy filter library.

WARNING: This filter alone cannot be used for direct solar observation!


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 front-side markings
  • 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
≤505 - 520 nm
Central wavelength 513 nm (for the C2 lines at 511 and 514 nm)
Half-bandwidth ≤15 nm
Type of filter
Bandpass
Usage
Gas evolution of comets, O-III-parallel Imaging, Contrast Enhancement
AR-coating
Phantom Group coating, planeoptically polished
Filter thickness 2 mm (without cell), 6 mm with cell
Filter size 1.25" / 2" mounted
SKU

BA2961860 (1.25"), BA2961863 (2")

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BAADER C2 SWAN-BAND FILTER FOR COMETS.

BAADER C2 SWAN-BAND FILTER FOR COMETS

From $79.00 USD

Size

  • 1.25"
  • 2"

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2 mm

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