FOCAS instrument parameters
In June 2010, the CCDs have been replaced with fully-depleted type CCDs by Hamamatsu Photonics K.K.
Check this page for more information.
| Detectors | 2 2K x 4K 4-side buttable CCDs (Hamamatsu) |
| Pixel size | 15 um |
| Pixel scale | 0.104'' |
| 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%) |