This file is the master list of AAT filters for scientific use in AAT instruments. In particular, it defines the "AAO Filter Number" for each filter. This number is for use in file headers, etc. so that future records can know exactly which physical piece of glass is used in scientific observations.

Since the function of this list is to handle scientifically useful filters, it will not list every piece of glass in the observatory (like guider filters, old photomultiplier filters, or test equipment filters), but should list all those used to obtain AAT data.

• AAO# - is a unique and arbitrary AAO running number assigned to each filter.
• Filter, lam/dlam - Descriptive names for each filter are given, along with approximate wavelengths and bandpasses in nanometres. These wavelengths should be used as a guide only. To specify an AAO filter uniquely use the AAO#.
• Thickness - The physical thickness of the filter in millimetres, unless the flag "(o)" is noted, in which case the thickness is an optical thickness.
• Size - The dimensions of the filter in millimetres.
• Focus Offset - The focus offset (in millimetres) to be applied to the f/3.3 top-end to focus this filter for use with the doublet corrector, unless indicated with a "(t)" in which case the triplet corrector is referred to. A focus offset of 0.0 corresponds to no filter.
• Details - Details of the filter including its recipe (where known) and the filter set it forms part of.
• Comments - Comments
• Peak - Approximate peak throughput of the filter
• Bandpass - Data and plots of the filter bandpass, where available.

AAO#	Filter	lam/ dlam (nm)	Thick (mm)	Size (mm)	Focus Offset (mm)	System	Details	Comments	Peak	Band pass
1	B	440/105	6	50x50	2.0		2mm GG385 + 1mm BG12 + 1mm BG18 + 2mm KG3	Low trans. Rarely used. Marked #1	56%	Plot Data
2	V	530/90	6	50x50	2.05		2mm GG495 + 2mm BG18 + 2mm KG3	" Marked #2	70%	Plot Data
3	R	670/115	6	50x50	2.12		2mm RG610 + 2mm KG3 + 2mm BG20	" Marked #3	73%	Plot Data
4	I		3	50x50	1.05		3mm RG9	" Marked #4	95%	Plot Data
5	BJ	450/105	6	50x50	2.02		2mm GG385 + 2mm BG28 + 2mm KG3	Match J emulsion. Marked #5	58%	Plot Data
6	RF	660/55	8	50x50	2.95		2mm RG630 + 3mm BG20 + 1mm BG38 + 2mm KG3	Match F emulsion. Marked #6B,RF	38%	Plot Data
7	IN		5	50x50	1.88		3mm RG695 + 2mm KG2	Match N emulsion. Marked #7	72%	Plot Data
8	B*	520/190	6	50x50	2.11		2mm GG385 + 2mm BG18 + 2mm KG3	Broad B Marked #8	73%	Plot Data
9	R*	650/125	4	50x50	1.32		2mm RG610 + 2mm KG3	Broad R	75%	Plot Data
10	RG695		3	50x50	1.0		3mm RG695	Marked #10
11	RG780		3	50x50	1.0		3mm RG780	Marked #11
12	RG830		3	50x50	1.0		3mm RG830	Marked #12
13	KG3		2	50x50	0.8		2mm KG3	Marked #13
14	O*	620/160	4	50x50	1.3		2mm OG570 + 2mm KG3	Very broad R filter. Marked O*	85%	Plot Data
15		660/11	2	50x50		Halpha		Shows signs of deterioration at edges Not recommended.	45%
16		669/12	3	50x50		Halpha		Shows signs of deterioration at edges Not recommended.	48%
17		681/12	3	50 Ø		Halpha		Shows signs of deterioration at edges Not recommended.	56%
18		690/8	2	50x50		Halpha		Shows signs of deterioration at edges Not recommended.	44%
19		709/8	3	50x50		Halpha		Shows signs of deterioration at edges Not recommended.	46%
20		712/13	5	50x50		Halpha		Shows signs of deterioration at edges Not recommended.	40%
21	U	360/65	10	50 Ø	3.35		1mm UG1 +  5mm CuSO4(liquid)	Liquid CuSO4 has bubbles	79%	Plot Data
22	B	445/115	5.7	50x50	2.05	KPNO		Used for Prime and Aux imaging Marked "B29"	85%	Plot Data
23	V	550/120	5.6	50x50	2.10	KPNO		Used for Prime and Aux imaging Marked "V29"	77%	Plot Data
24	R	660/135	3.1	50x50	1.10	KPNO		Used for Prime and Aux imaging Marked "R28"	92%	Plot Data
25	I	820/175	3.2	50x50	1.30	KPNO		Used for Prime and Aux imaging Marked "I28"	85%	Plot Data
26	B		5.7	50x50	2.05	KPNO		Spare. Used for Acquisition Marked "B28"	85%	Plot Data
27	V		5.6	50x50	2.10	KPNO		Spare. Used for Acquisition Marked "V28"	77%	Plot Data
28	R		3.1	50x50	1.10	KPNO		Spare. Used for Acquisition Marked "R27"	92%	Plot Data
29	I		3.2	50x50	1.30	KPNO		Spare. Used for Acquisition Marked "I27"	85%	Plot Data
30	B		5	100 Ø	1.88	LDSS	2mm GG395 + 1mm BG12 + 2mm BG40	Focus estimated from thickness (not measured)
31	V		?	100 Ø	?.??	LDSS	2mm GG495 + 2mm BG39	"
32	R		4	100 Ø	1.32	LDSS	2mm OG570 + 2mm KG3	"
33	I		2	100 Ø	0.8	LDSS Set	2mm RG9	"
34	B			50 Ø		f/1 Schott glass
35	V			50 Ø		f/1 Schott glass
36	R			50 Ø		f/1 Schott glass
37	I			50 Ø		f/1 Schott glass
38	V+R			50 Ø		f/1 Schott glass
39	U		4	50x50		SL Schott Glass	1mm UG1 + 3mmBG40	"
40	B		4	50x50	1.32	SL Schott Glass	2mm GG385 + 1mm BG12 + 1mm BG39	Focus estimated from thickness (not measured)
41	V		4	50x50	1.32	SL Schott Glass	2mm GG495 + 2mm BG39	"
42	R		4	50x50	1.32	SL Schott Glass	2mm OG570 + 2mm KG3	"
43	I		4	50x50	1.32	SL Schott Glass	4mm RG9	"
44	B	440/95	7	75 Ø	2.39	ANU	4mm GG395 + 1mm BG12 + 2mm BG39	Focus estimated from thickness (not measured)	59%	Plot Data
45	V	530/90	5	75 Ø	1.88	ANU	2mm GG495 + 3mm BG39	"	78%	Plot Data
46	R	610/120	5	75 Ø	1.88	ANU	2mm OG570 + 3mm KG3	"	73%	Plot Data
47	I		3	75 Ø	1.05	ANU	3mm RG9	"	88%	Plot Data
48	U		5	165x165	See WFI pages	WFI Schott	1mm UG1 + 2mm S8612 + 2mm WG295	See Note 1	55.6%	Plot Data
49	B		5	165x165	See WFI pages	WFI Schott	1mm GG395 + 3mm BG37 + 1mm BG39	See Note 1	71.7%	Plot Data
50	V		4	165x165	See WFI pages	WFI Schott	2mm GG495 + 2mm BG39	See Note 1	87.1%	Plot Data
51	R		4	165x165	See WFI pages	WFI Schott	2mm OG570 + 2mm KG3	See Note 1	78.5%	Plot Data
52	I		3	165x165	-	WFI Schott	3mm RG9 + 890nm low pass coating	Damaged. Use SDSS i filter.
53	He II	469/3	6.5	76 Ø		Taurus			77%	Plot Data
54	[O III]	501.7/4.5	8	76 Ø		Taurus			95%	Plot Data
55	He I/Na D	590/4	6	76 Ø		Taurus			71%	Plot Data
56	[O I]	630/4	6	76 Ø		Taurus			73%	Plot Data
57	H alpha	658.3/4.5	6	76 Ø		Taurus			93%	Plot Data
58	[S II]	673.4/4.5	6	76 Ø		Taurus			97%	Plot Data
59	[C I]	873.7/0.4	9	76 Ø		Taurus				Plot
60		488/10	10	76 Ø		Taurus		WHT Filter f101	67%	Plot Data
62		522/38	7	63.5 Ø		Taurus		WHT Filter f126	69%	Plot Data
63		501/40	7	63.5 Ø		Taurus		WHT Filter f107	69%	Plot Data
70	B0	375/19	?	123 Ø		TTF			73%	Plot Data
71	B1	390/17	7	123 Ø		TTF			72%	Plot Data
72	B2	411/15	5	123 Ø		TTF			64%	Plot Data
73	B4	500/32	7	123 Ø		TTF			76%	Plot Data
74	B6	582/19	5.5	123 Ø		TTF			72%	Plot Data
79	U		5	100 Ø		Taurus U	1mm UG1 + 2mm S8612 + 2mm WG295
80	R0	665/21	?	123 Ø		TTF			89%	Plot Data
81	R1	710/29	5	123 Ø		TTF			87%	Plot Data
83	R3	760/32.6	7	123 Ø		TTF			89%	Plot Data
84	R5	815/37.2	7	123 Ø		TTF			76%	Plot Data
85	R6	854/40	6	123 Ø		TTF			95%	Plot Data
86	R8	910/46.4	5	123 Ø		TTF			89%	Plot Data
87	R4	782/40.5	?	123 Ø		TTF				Data
90	g		5.0	162x162	See WFI pages	WFI SDSS		152x152 clear ap.	88%	Data
91	r		4.7	162x162	See WFI pages	WFI SDSS		152x152 clear ap.	95%	Data
92	i		5.0	162x162	See WFI pages	WFI SDSS		152x152 clear ap.	96%	Data
93	z		5.0	162x162	See WFI pages	WFI SDSS		152x152 clear ap.	98%	Data
100	H alpha	656/19	1.45	254x254	1.45 (o)	Phot.Narrow Band		Usable, but delaminating in one corner.
101	[O II]	373/6	1.80 (o)	127x127	1.14	Phot.Narrow Band
102	H gamma	434/6	1.80 (o)	127x127	1.14	Phot.Narrow Band
103	He II	468/7	1.77 (o)	127x127	1.11	Phot.Narrow Band
104	H beta	486/7	1.71 (o)	127x127	1.05	Phot.Narrow Band
105	[O III]	501/8	1.79 (o)	127x127	1.13	Phot.Narrow Band
106	He I	587/9	1.74 (o)	127x127	1.08	Phot.Narrow Band
107	[O I]	630/9	1.75 (o)	127x127	1.09	Phot.Narrow Band
108	H alpha	656/10	1.65 (o)	127x127	0.99	Phot.Narrow Band
109	[S II]	672/10	1.60 (o)	127x127	0.94	Phot.Narrow Band
110	U cont	365/10	(1.53) (o)	127x127	(0.86)	Phot.Narrow Band
111	B cont	460/20	1.85 (o)	127x127	1.20	Phot.Narrow Band
112	V cont	540/40	1.70 (o)	127x127	1.04	Phot.Narrow Band
113	R cont	643/10	1.69 (o)	127x127	1.03	Phot.Narrow Band
114	UG1		2.0	254x254	?.?	Schott Glass
115	GG385		2.0	254x254	?.?	Schott Glass
116	GG395		2.0	254x254	?.?	Schott Glass
117	GG475		2.0	254x254	?.?	Schott Glass
118	GG495		2.0	254x254	?.?	Schott Glass
119	GG530		2.0	254x254	?.?	Schott Glass
120	GG590		2.0	254x254	?.?	Schott Glass
121	RG610		2.0	254x254	?.?	Schott Glass
122	RG630		2.0	254x254	?.?	Schott Glass
123	RG665		2.0	254x254	?.?	Schott Glass
124	RG695		2.0	254x254	?.?	Schott Glass
125	RG715		2.0	254x254	?.?	Schott Glass
126	RG9		3.0	254x254	?.?	Schott Glass
127	BJ		3.0	254x254	?.?	Schott Glass	2mm GG395 + 1mm BG37	Yields B with IIIaJ emulsion
128	VF		3.25	254x254	?.?	Schott Glass	2mm GG495 + 1.25mm BG18	Yields V with IIIaF emulsion
129	Gunn-Thuan g		4	50x50	?.?	Gunn-Thuan	PASP,88,543	Shows signs of deterioration at edges
130	Halpha+Hbeta			?.?	?.?	Rugate Narrow Band	>	Special dual bandpass filter
131	Ly_redshift	410.7/5.4	12.0	146x146	?.?	Narrow Band		Visitor NASA filter
132	GG475		2	100mmØ		LDSS Order sorter	2mm GG475
133	OG515		2	100mmØ		LDSS Order sorter	2mm OG515
134	OG550		2	100mmØ		LDSS Order sorter	2mm OG550

Notes

The WFI Schott filter profile data are  predicted (not measured). They are derived from the Schott glasses used in their manufacture. These throughputs do not include the effects of relection at the filter surfaces, which will reduce their overall throughput by a further 8%. The peak throughput indicated in column 10 includes this extra 8% reflection loss.

21 January 2005  cgt