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Applying for time


More about ACAM

For ING staff

Chris Benn
ACAM Instrument Specialist

ACAM - auxiliary-port camera


ACAM (Auxiliary-port CAMera) is mounted permanently at a folded-Cassegrain focus of the 4.2-m William Herschel Telescope. It can be used for high-throughput broad-band imaging, narrow-band imaging and low-resolution spectroscopy.

The field of view in imaging mode is 8 arcmin (0.25 arcsec/pixel). A set of broad-band filters is available by default (usually Sloan u g r i z) but almost any of ING's filters can be mounted in ACAM.

Low-resolution spectroscopy over ~ 3500 - 9400 A is provided by a VPH disperser. For 1.0- and 0.5-arcsec slits, the on-axis spectroscopic resolutions at 6000 A are R ~ 450 and 900 respectively. At 7000 A, the throughput of ACAM is a factor ~ 1.5 times higher than that of ISIS.

ACAM, like its predecessor (the aux-port camera), is available whenever a prime-focus instrument is not in use, so is well-suited to observing override programmes and targets of opportunity.


2015 July: Script autoflat available to take sky flats through specified series of filters.

2014 April: Dither scripts multdither and mcol now available.

2013 December: 27-arcsec slit now available (useful for minimising differential losses between target and comparison star).

2012 October: Quick-look spectroscopic extraction available.

2011 May: Sloan u, z (and new g, r, i) filters now available.

2011 February: Sloan u filter (ING filter #700) delivered (z and new g r i still to come).

2011 January: Transmitted wavefront errors measured for most filters.

2010 November: GG395 and GG495 order-sorting filters now available, for use with the VPH disperser.

2010 October: Target-acquisisition tool commissioned, for use with spectroscopy mode.

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Contact:  (ACAM Instrument Specialist)
Last modified: 21 November 2014