FOCAS Instrument Parameters

In June 2010, the CCDs have been replaced with fully-depleted type CCDs by Hamamatsu Photonics K.K.

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Parameter	Specification
Detectors	2 2K x 4K 4-side buttable CCDs (Hamamatsu)
Pixel size	15 um
Pixel scale	0.1038''
Field of view	6' (circular)
Gain	1.9 - 2.1 e-/ADU
Dark current	< 0.1 e-/s
Read noise	4 e- rms
Saturation level	40 000 e-
Readout time	24 s (whole CCD area, no binning)
Min. exposure time	0.5 s (3%) or 1.0 s (1%)