Quick approximate comparison of S2KB and HDI:

Michael Richmond
Oct 28, 2013

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
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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

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