This 2048X2048 imaging CCD camera was available at the West focus of the T90 telescope. This camera is based on a high quantum efficiency back-illuminated CCD chip, with enhanced response in the ultraviolet. The CCD chip is the same as the old T150 Versarray CCD (retired in 2018): a scientific grade Marconi-EEV CCD42-40 of 2048x2048 pixels. The exact model is the so-called Princeton Instruments VersArray 2048B.
General characteristics
| Array | VersArray 2048 x 2048 |
| Pixel size | 13.5 µm |
| Scale | 0.387 "/pixel |
| FoV | 13.20' x 13.20' |
| Read-out time (fast mode) | 15 sec (binning 1x1); 3 sec (binning 2x2) |
| Read-out time (low mode) | 45 sec (binning 1x1); 6 sec (binning 2x2) |
| Gain | 1.35 ± 0.02 e¯/ADU (see gains and read noises) |
| Read noise | 7.14 ± 0.10 e¯ rms |
| Dark current | 1 e¯/pixel/hr (-110° C) |
| Orientation | North-Up, East-Left |
| Lineality | see lineality test |
More information in detailed characteristics and technical manual of the CCD camera.
Filters
The filter wheel provide six positions for 50mm square filters.