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 taking dome flats (using the CLSD lamps at 12V), an approximate Exptime for 20k counts is provided. 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. For these, a second exposure time is listed 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.
- For most filters, the Central Wavelength and Filter Width (both in Å) are listed.
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