FOCAS readout modes
FOCAS has a number of readout modes for on-chip binning of data. This can be useful to significantly improve the signal-to-noise ratio for faint objects, or where resolution (spatial and/or spectral) is not essential.
Note: Since 2003 September, longer readout time is required to reduce read noise.
Some partial readout modes with either 1 x 1 or 2 x 2 binning are available for quicker target acquisition on slits.