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4-inch Filter Requests (1Jun94)
(from KPNO, NOAO Newsletter No. 38, 1 June 1994)

Due to the numerous locations at which 4-inch filters can now be used
on the mountain, competition for our specialty filters is expected to
be high, since our supply of these filters is limited.  For example, we
have only one set of 4-inch redshifted Ha filters.  If you require a
specific 4-inch filter and can't live with a 2-inch substitute, we urge
you to note this in your proposal and to make certain that your
observing run preparation form is submitted well in advance of your run
with a statement regarding your filter needs.

We will attempt to obtain duplicates of high-demand 4-inch filters in
the future; however, this will be a slow process because of the high
cost of most of the filters.

Sam Barden, Ed Carder, Jim DeVeny

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