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NOTCam Ks filter

NOT filter number:207
Dimensions:25-mm round.
Status:mounted
Filter name:Ks
Marking on filter edge:
Cosmetic defects:


on: 1.990 micron
central:
off: 2.300 micron
FWHM: 0.310 micron


  • Transmission curves: gif image, ASCII data
    Note:These transmission data have been scanned from the manufacturer's hardcopy. They are probably good to a couple of %. Details of the scanning procedure are not known, but the scan was made at ambient temperature. A small shift to the blue will be effected at operating temperature.

  • Notes: Purchased as part of the Gemini NIR filter consortium.

  • About the Ks filter: The Ks (K-short) filter has a shorter cut-off wavelength than the standard K band in order to lower the thermal component of the background (developed by M. Skrutskie). The cut-on wavelength of Ks is the same as for K, which makes it more useful than K' at "not very dry sites", although the passband becomes a bit narrower than for K.

  • Back to top Last modified: 30-Jan-2006