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Blocking Filters

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The table below lists all filters, including the wavenumbers/wavelengths of half the maximum transmission, that are available for use with Phoenix. Note that the CVF filters described in the NOAO Instrument Manual are no longer available. The second filter wheel is called CVF for historical reasons only.

Name Start 1
(cm-1=µm)		 Stop 1 
(cm-1=µm)		 Transmission
(%)		 Echelle
order 2 
Filter  (Top) Wheel 
(12 filters + open position)
M2030 1980 = 5.050 2080 = 4.808 85 11
M2150 2105 = 4.751 2190 = 4.566 84 12
L2734 2680 = 3.731 2770 = 3.610 80 15
L3290 3240 = 3.085 3355 = 2.980 80 19
K4220 4188 = 2.392 4263 = 2.348 59 24
K4308 4258 = 2.349 4355 = 2.296 50 24
K4484 4429 = 2.250 4525 = 2.210 67 25
K4748 4704 = 2.126 4803 = 2.082 74 27
H6420 6377 = 1.568 6464 = 1.547 66 36
J7799 7750 = 1.290 7865 =1.271 65 44
J82653 8243=1.213 8360 = 1.196 50 47
J9232 9183 = 1.089 9286 = 1.077 42 52
CVF (Bottom) Wheel 
(9 filters + Open position + ND filter)
M1930 1890 = 5.291 1970 = 5.076 80 11
L2462 2410 = 4.149 2495 = 4.008 85 14
L2870 2820 = 3.545 2910 = 3.436 85 16
L3010 2950 = 3.390 3050 = 3.279 90 17
L3100 3030 = 3.300 3145 = 3.180 91 17
K4396 4355 = 2.296 4446 =2.249 55 25
K4578 4525 = 2.210 4630 = 2.160 65 26
K4667 4617 = 2.166 4717 = 2.120 73 26
H6073 6017 = 1.662 6129 = 1.632 84 34

1At full transmission, wings extend further.
2At center of band pass.

3Filter is no longer installed  

Filter data obtained from the NOAO Phoenix filters web page.

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