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Large Filters for CCD Imaging (1Dec94)
(from CTIO, NOAO Newsletter No. 40, 1 December 1994)

We are slowly building up our stock of 4 X 4 inch filters for imaging with
large CCDs at the 4-m prime focus and, for next semester, at the Schmidt
telescope. Given the expense of these filters, we have decided not to
duplicate some of them in the 3 X 3 inch size required for the 0.9-m, 1.5-m
and 4-m Cassegrain filter wheels. Instead, we have modified a filter wheel
module such that it will accommodate the larger filters at these focal
positions, if need be. In the unlikely case of a conflict of interest, the
observer at the larger telescope has priority. The full list of CTIO filters can
be found via anonymous ftp to ctios1.ctio.noao.edu as described in
Newsletter No. 34, p.11. However, for convenience we give below a list of
the 4 X 4 filters that we have now or expect to have delivered in the near
future.

    Johnson Kron-Cousins UBVRI (two sets)
    Washington CMT1
    DDO 51
    Stromgren uvby
    Gunn griz
    HST F555W, F814W
    Tyson J
    [SII] 6723 / 50
    [OIII] 5008 / 50
    Hà 6563, 6600 /75

Alistair Walker, Bob Schommer, Steve Heathcote

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