UIST has two 24-slot filter wheels which contain filters for both imaging and for blocking the spectroscopy grisms. The MKO consortium filter set is installed where possible (see the discussion of new JHK standards for example). Click on the filter name to see an image of the profile (where available). Text files are also available giving transmission profiles for some of the filters, contact Sandy Leggett. The table below lists the filter wheels’ population. 

September 2002 – 1 March 2003

Wheel 1

Posn	Filter	50% Cut on	50% Cut off
1	Open	–	–
2	Blank	–	–
3	Blank blank	–	–
4	Blank	–	–
5	Hartmann mask	–	–
6	Blank	–	–
7	Blank	–	–
8	Blank	–	–
9	1.57(cont) [MK]	1.560	1.580
10	FeII[MK]	1.636	1.652
11	2.248(S1)	2.238	2.258
12	Blank	–	–
13	2.122(S1)	2.112	2.130
14	Blank	–	–
15	BrG	2.151	2.171
16	CH4_s	1.537	1.653
17	CH4_I	1.631	1.748
18	2.27cont[98]	2.260	2.280
19	2.42CO	2.413	2.436
20	K[MK]	2.03	2.37
21	Blank	–	–
22	3.28″Dust”	3.250	3.305
23	M'[MK]	4.572	4.800
24	Blank	–	–

Wheel 2

Posn	Filter	50% Cut on	50% Cut off
1	Open	–	–
2	Blank	–	–
3	H[MK]	1.49	1.78
4	J[MK]	1.17	1.33
5	J-spectral	–	–
6	HK-spectral	–	–
7	H-spectral	–	–
8	KL-spectral	–	–
9	L-spectral	–	–
10	Blank	–	–
11	CGS4-B2	1.43	2.60
12	Blank	–	–
13	3.4nbL	3.379	3.451
14	3.5mbL	3.383	3.594
15	3.6nbLp	3.560	3.625
16	3.99(cont)	3.964	4.016
17	BrA	4.025	4.080
18	Blank	–	–
19	Blank	–	–
20	Blank	–	–
21	M-spectral	–	–
22	Blank	–	–
23	L'[MK]	3.428	4.108
24	blank	–	–