From
AO-16 (announced in 2016) it is possible for programmes with specific
approval by OTAC to perform several turns of the filter wheel. In other
words it is possible to perform series of exposures in which a sequence
of filters (ordered in increasing filter wheel position numbers) is
repeated several times. A user without OTAC approval for additional
filter wheel rotations will get an error message if the sequence of OM
exposures does not have an increasing filter wheel position number.
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