The information on this page is for quick reference. Please consult the LMI Users Manual for more detailed information, including filter transmission curves and data.
LMI Filters:
Currently available filters for LMI are given in the table below.
FILTERS
keyword of your image headers. Sample dome flats for the various filters taken over time can be found on the LMI Filter Characterization page.
Filter | FITS Header Value | Pattern String | Focus Offset (µm) | Exptime for 20k counts (seconds) | Filter Central Wavelength (Å) | Filter Width (Å) |
---|---|---|---|---|---|---|
Non-Filter Positions | ||||||
OPEN | OPEN | OPEN | 0 | |||
DARK | DARK | DARK | N/A | |||
4 Hole Mask | 4HOLEMASK | 4Hole | ||||
Johnson-Cousins Filters | ||||||
U | U | U | +140 | 178 / 4* | ||
B | B | B | +105 | 9 | ||
V | V | V | +105 | 5 | ||
R | R | R | +140 | 3.5 | ||
I | I | I | +140 | 3.3 | ||
Sloan (SDSS) Filters | ||||||
SDSS u' | SDSS-U | SL-u | +180 | 313 / 4.5* | ||
SDSS g' | SDSS-G | SL-g | +180 | 4.5 | ||
SDSS r' | SDSS-R | SL-r | +180 | 3.5 | ||
SDSS i' | SDSS-I | SL-i | +180 | 4.25 | ||
SDSS z' | SDSS-Z | SL-z | +180 | 3.25 | ||
Other Broad Band Filters | ||||||
V+R | VR | VR | +185 | 6091.7 | 1763.9 | |
Yish | YISH | YISH | +105 | 26 | ||
General Narrow Band Filters | ||||||
[OIII] | OIII | OIII | +205 | 180 | 5001.7 | 25.5 |
Hα-On | HALPHAON | Ha-on | +155 | 115 | 6564.9 | 30.1 |
Hα-Off | HALPHAOFF | Ha-off | +155 | 37 | 6459.1 | 114.6 |
Wolf-Rayet Filters | ||||||
WC | WR-WC | WC | +165 | 115 | 4660.4 | 49.5 |
WN | WR-WN | WN | +160 | 4690.9 | 49.6 | |
CT | WR-CT | CT | +170 | 4756.1 | 54.6 | |
Comet Filters (Note: These filters are 4 inches round and suffer some vignetting on LMI) | ||||||
Ultraviolet Continuum | UC | UC | +175 | 500** / 80* | 3449 | 79 |
Blue Continuum | BC | BC | +175 | 130 / 3.5* | 4453 | 61 |
Green Continuum | GC | GC | +175 | 119 | 5259 | 56 |
Red Continuum | RC | RC | +175 | 70 | 7133 | 58 |
C2 | C2 | C2 | +175 | 46 | 5135 | 119 |
C3 | C3 | C3 | +175 | 4063 | 58 | |
CN | CN | CN | +175 | 480 / 14* | 3869 | 56 |
CO+ | CO+ | CO+ | +175 | 160 | 4266 | 64 |
H2O+ | H2O+ | H2O+ | +175 | 7028 | 164 | |
OH | OH | OH | +175 | 480** / 400* | 3097 | 58 |
NH | NH | NH | +175 | 3361 | 54 | |
Assorted Other Filters (inquire if you want to use, as they may not be readily available) | ||||||
W032 | W032 | W032 | +176 | 5300 | ||
5027 | 5027 | 5027 | +130 | 5027 | ||
K1593 | K1593 | K1593 | +194 | 5010 |
** OH & UC counts were at about the bias level for this exposure time using the CLSD lamps at 12V.
* Using the photo floods (a.k.a. IGRINS lamps) on the LMI lamp boom