The Maryland-Magellan Tunable Filter
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Wavelength Calculator
Emission-Line Transmission
Exposure Time Calculator
MMTF Emission-Line Transmission Calculator (TCALC)
Transmission curves of MMTF blocking filters.
Rest Wavelength [nm] :
Choose Emission Line
Lyα
[O II] (372.6)
[O II] (372.9)
He II (468.6)
Hβ
[O III] (495.9)
[O III] (500.7)
He I (587.6)
[Fe VII] (608.7)
[O I] (630.0)
[N II] (654.8)
Hα
[N II] (658.3)
[S II] (671.6)
[S II] (673.1)
[S III] (906.9)
Other
Redshift:
Wavelength:
nm
Filter:
Å
Transmission:
%
This JavaScript calculator provides the MMTF filter transmission at a given wavelength, using the set of blocking filters shown in the figure to the right. Observers should ensure that all of their planned observations have at least 25% transmission at the redshifted wavelength.
If you are considering the purchase of a narrow-band filter not listed here and are interested in making it available for use with MMTF, or have other questions about filters, please
contact Sylvain Veilleux
. Filter bandpasses must fall in the high-reflectivity part of the interior plate coating transmission curve; this range is roughly 5000-9500 Å (see
Figure
).