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.
- The value shown under FITS Header will appear in the
FILTERSkeyword of your image headers. - The Pattern String is the LOUI display string you need to use if creating a Telescope Motion Pattern File.
- Focus Offset indicates how much additional focus offset is applied to the Active Optics System to account for filter refraction – it is most helpful for determining which filters are parfocal.
- For most filters, the Central Wavelength and Filter Width (both in Å) are listed.
- The Flatfield Lamps indicate the recommended lamp set to use with each filter for efficient flat field images. For the bluest filters (both broad- and narrow-band), the usual "LMI Lamps" do not provide sufficient flux in the bandpass to easily collect dome flats, and we recommend using the Photo Floods (a.k.a. IGRINS lamps) on the lamp boom. These are 600-W photographic flood lamps with very short lifetimes – please use sparingly.
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