Filters Available at SOAR

*Updated Nov 7, 2016 (C. Briceño)*

All filters available for imaging or spectroscopic order-sorting at listed on this page, or via links below. Some filters can be used on more than one instrument, so please check the full listing if you have special needs.

**4 x 4 Inches Square Filters for imaging with the Goodman HTS or with SOI**
(SOI can also use 3x3 inch filters without vignetting)
Filter Name	Filter Set	Central Wavelength/ FWHM (A)	Transmission Curve
u	Stromgren [1]	3460/441	plot [2] / data [3]
u'	SDSS [4]	3529/719	plot [5] / data [6]
U	Bessell [7]	3624/784	plot [8] / data [9]
v	Stromgren [1]	4084/207	plot [10] / data [11]
B	Bessell [7]	4326/1269	plot [12] / data [13]
b	Stromgren [1]	4694/229	plot [14] / data
g'	SDSS [4]	4737/1734	plot [15] / data [16]
V	Bessell [7]	5332/1073	plot [17] / data [18]
y	Stromgren [1]	5455/285	plot [19] / data [20]
r'	SDSS [4]	6271/1779	plot [21] / data [22]
R	Bessell [7]	6289/1922	plot [23] / data [24]
VR	Wide VR filter	6000/2410	plot [25]
Halpha (CTIO set)	narrow [26]	6563/75	plot [27] / data [28]
[S II] (CTIO set)	narrow [26]	6738/50	plot [29] / data [30]
Halpha 6600 (CTIO set)	narrow [26]	6600/75
[OIII] (CTIO set)	narrow [26]	5019/50
i'	SDSS [4]	7731/2006	plot [31] / data [32]
TiO	Wing [26]	7779/125	plot [33] / data [34]
CN	Wing [26]	8123/116	plot [35] / data [36]
I	Bessell [7]	8665/3914	plot [37] / data [38]
z'	SDSS [4]	10094/4842	plot [39] / data [40]

SAMI Filters (3 x 3 Inches Square)

SAMI has one filter wheel with 7 positions for 3 inch square filters. The new SAMI Filter page [41] lists the characteristics of the two new broadband filter sets, plus an assortment of narrow band filters, which have been specifically designed and built for use on SAMI: a Kron-Cousins BVRI set, a SDSS griz set, and Ha, NI, [NII] and [SII] narrow band filters, in addition to several redshifted Ha filters designed for the Fabry-Perot module (more details in this link [42]). Any of these filters are readily available for use with SAMI. Additional 3x3 inch filters from the CTIO filter stock (click here [43]) can also be requested.

Goodman Circular 4 Inch Diameter Filters

FILTER NAME	Adapted from Bessell 2005 (ARAA, 43, 293, Fig. 1)
Johnson U	Central wavelength = 366
Johnson B	Central wavelength = 436
Johnson V	Central wavelength = 545
Kron-Cousins Rc	Central wavelength = 641
Order blocking GG-385	Cutoff wavelength: < 385
Order blocking GG-455	Cutoff wavelength: < 455
Order blocking GG-495	Cutoff wavelength: < 495
Order blocking OG-590	Cutoff wavelength: < 590
Order blocking S8612	Wavelength range: ~330-620 (data [44], plot) [45]

SPARTAN Filters

CTIO Imaging Filters

Information on the 3x3 inch and 4x4 inch square filters available at CTIO can be found here [43]. These filters can generally be borrowed for use for imaging on SOAR, although older filters may need testing to confirm that their performance is acceptable.