Filters Available at SOAR
Filter Name | Filter Set | Central Wavelength/ FWHM (A) |
Transmission Curve |
---|---|---|---|
u | Stromgren | 3460/441 | plot / data |
u' | SDSS | 3529/719 | plot / data |
U | Bessell | 3624/784 | plot / data |
v | Stromgren | 4084/207 | plot / data |
B | Bessell | 4326/1269 | plot / data |
b | Stromgren | 4694/229 | plot / data |
g' | SDSS | 4737/1734 | plot / data |
V | Bessell | 5332/1073 | plot / data |
y | Stromgren | 5455/285 | plot / data |
r' | SDSS | 6271/1779 | plot / data |
R | Bessell | 6289/1922 | plot / data |
VR | Wide VR filter | 6000/2410 | plot |
Halpha (CTIO set) | narrow | 6563/75 | plot / data |
[S II] (CTIO set) | narrow | 6738/50 | plot / data |
Halpha 6600 (CTIO set) | narrow | 6600/75 | |
[OIII] (CTIO set) | narrow | 5019/50 | |
i' | SDSS | 7731/2006 | plot / data |
TiO | Wing | 7779/125 | plot / data |
CN | Wing | 8123/116 | plot / data |
I | Bessell | 8665/3914 | plot / data |
z' | SDSS | 10094/4842 | plot / data |
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 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). Any of these filters are readily available for use with SAMI. Additional 3x3 inch filters from the CTIO filter stock (click here) 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, plot) |
SPARTAN Filters

CTIO Imaging Filters
Information on the 3x3 inch and 4x4 inch square filters available at CTIO can be found here. 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.