The table below provides a quick and only approximate comparison of the properties of the old (S2KB) and new (HDI) imaging cameras. The values for readout noise, readout time, and quantum efficiency are only approximate.
S2KB HDI
---------------------------------------------------------------------
Pixel size 21 x 21 um 15 x 15 um
0.6 x 0.6 arcsec 0.43 x 0.43 arcsec
# pixels 2048 x 2048 4096 x 4112
area on sky 20.5 x 20.5 arcmin 29.2 x 29.2 arcmin
readnoise 9, 14, 20 4, 5, 7, 10
(various modes)
readout time 180 sec 60 sec / N amplifiers
(1x1 bin) (N = 1, 4)
well depth (e-) 240,000 300,000
coolant LN2 closed system
QE at 300 nm 10 % 35 %
350 35 50
400 70 75
450 75 80
500 77 80
650 90 75
750 80 70
850 50 55
950 25 25
---------------------------------------------------------------------