NOTCam K' filter
| NOT filter number: | 206 |
| Dimensions: | 25-mm round. |
| Status: | mounted |
| Filter name: | K' |
| Marking on filter edge: | |
| Cosmetic defects: | |
 on: |
1.941 micron |
| central: |
|
| off: |
2.292 micron |
| FWHM: |
0.351 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 K' filter: This filter was designed with the passband
located a bit shortward of the standard K band in order to lower the
thermal component of the background. See: Wainscoat & Lennox (1992, AJ 103,
332) for reference. Its short cut-on wavelength was intended to take advantage
of the reduced water-vapour extinction above Mauna Kea (see: Handbook of IR
astronomy, Glass, 1999).
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