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Filters

From SharedSkies

A common system of filters is available for use with the CCD cameras at Moore and Mt. Kent Observatory. With some exceptions, noted below, all filters are mounted in wheels that may be changed on request.



Sloan Photometry

There is a set of Sloan filters for each of the RC24, CDK20N, CDK20S, and CDK700 telescopes. Each set is in a wheel with 6 openings assigned serially.


  • (1) g' (400-530)
  • (2) r' (530-700)
  • (3) i' (700-825)
  • (4) z' (825-1100)
  • (5) blue block (500-1100)
  • (6) Open


Astrodon sloan.jpg


Astrodon cbb.jpg


Transformation from Sloan to UBVRI Filter Bands

Transformation coefficients are discussed on the Sloan Digital Sky Survey Sloan Digital Sky Survey website


UBVRI Photometry

There is one UBVRI filter wheel at each observatory to be used as needed an any telescope with an IFW3 filter wheel.

  • (1) U (340-390)
  • (2) B (375-490)
  • (3) V (490-580)
  • (4) R (570-690)
  • (5) I (725-1025)
  • (6) Open


Ubvric ad.jpg

BGRC Color Imaging

There is one color imaging wheel at each site.

  • (1) C (350-1100)
  • (2) R (590-700)
  • (3) G (490-575)
  • (4) B (390-510)
  • (5) Open
  • (6) Open
Lrgb ad.jpg


Narrowband

There are three narrowband filter sets available. The wheels at Mt. Kent for CDK20S and CDK700 use Astrodon filters:

  • (1) [SII] (3/671.6)
  • (2) H alpha (3/656.3)
  • (3) Red continuum (5/645)
  • (4) [O III] (3/500.7)
  • (5) UV blocked clear
  • (6) Open


A wheel for the CDK20N is

  • (1) He I (5/1083.0) (Custom Scientific)
  • (2) [SII] (3/671.6)
  • (3) H alpha (3/656.3)
  • (4) Red continuum (5/645)
  • (5) [O III] (3/500.7)
  • (6) UV blocked clear


A wheel for use at the RC24 is

  • (1) [SII] (Custom Scientific)
  • (2) H alpha (Custom Scientific)
  • (3) Red continuum (Astrodon)
  • (4) Na D (590) (Custom Scientific)
  • (5) [OIII] (Custom Scientific)
  • (6) UV blocked clear (Astrodon)


Sii filter.jpg
Halpha 5nm ad.jpg
Red continuum ad.jpg
Oiii filter cs.jpg

SBIG STL Filters

The SBIG STL6303 cameras take 50 mm diameter filters in a 5-filter wheel. Moore and Mt. Kent observatories have the standard UBVRI set installed in the STL cameras:

  • (1) U (330-390)
  • (2) B (375-490)
  • (3) V (490-580)
  • (4) R (570-690)
  • (5) I (725-1025)

Additionally, at Mt. Kent there is a set of color imaging RGBC filters in a spare wheel. STL cameras require disassembly to change wheels.

The STL camera at Mt. Kent has been retired from Shared Skies and may be used on the APTA telescope there. The STL camera at Moore Observatory is in use on the FSQ roll roof telescope.