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We present a description of a new 1--5 $\mu$m filter set similar to thelong-used JHKLM filter set derived from that of Johnson. The new Mauna KeaObservatories Near-Infrared (MKO-NIR) filter set is designed to reducebackground noise, improve photometric transformations from observatory toobservatory, provide greater accuracy in extrapolating to zero air mass, andreduce the color dependence in the extinction coefficient in photometricreductions. We have also taken into account the requirements of adaptive opticsin setting the flatness specification of the filters. A complete technicaldescription is presented to facilitate the production of similar filters in thefuture.Comment: PASP, in press. 16 pages, 4 figures, 3 table

The Mauna Kea Observatories Near‐Infrared Filter Set. II. Specifications for a NewJHKL′M′ Filter Set for Infrared Astronomy