Observing Information
Comparison with Suprime-Cam
| Suprime-Cam | HSC | |
| CCD Make and Model | Hamamatsu S10892-01 | Hamamatsu S10892-02 |
| Number of CCDs | 10 | 104 + AG 4 + AF 8 |
| Pixel | 15 micron square (0.2 arc-sec) | 15 micron square (0.17 arcsec) |
| Field of View | 34 arcmin x 27 arcmin | 90 arcmin daiameter |
| Conversion Factor | 2.5-3.7 e/ADU | 3.0 e/ADU |
| Readout noise | ~ 10 e | TBD e |
| Readout time | 18 sec | 20 sec |
| Full well | 150,000 e | 150,000 e |
| Number of Filters | 10 | 6 |
| Filter Exchange Time | 300 s | 600 s (900 s while commissioning) |
CCD
Mosaic Arrangement
There are 104 main science CCDs, f CCDs for auto guider and 8 CCDs for auto focus. The gap between pixels on neigboring CCDs are about 1 mm (11 arc-sec). The bottom figures shows the actual CCD arrangement seen from the primary mirror.
Wide Field Corrector
Transmission Curve
Measured on the actual lens system averaged over six light paths (including on-axis and off-axis up to the edge)
| Wavelength [nm] | Measured [%] | Sepcification [%] |
| 405 | 81.6 | > 70 |
| 633 | 91.4 | > 85 |
| 1064 | 87.7 | > 80 |
Measured from coating samples. All lens samples are multiplied(csv).
Optics Design
Designed performance (in FWHM) is shown in the figure below; ○ for HSC and □ for Suprime-Cam. Green, red, cyan and black shows g, r, i, z band filter's result, respectively.