| Geometry |
|---|
| Number of detectors | 36 = 4 x 9 |
| Detector size (pixel) | 2048 x 4612 |
| Pixel scale @ center of the field (arcsec / pixel) | 0.187 |
| Camera field of view | 0.96 deg x 0.94 deg |
| Image quality degradation from center to edges | ~0.05 arcsec |
| Median seeing at center (reduced 2003A sample) | g': 0.77 arcsec, i': 0.66 arcsec |
| Photometry |
|---|
| Magnitude system | AB |
| Filters | u*, g', r', i', z' |
| Zero points (e- / sec) at 1 airmass | 25.77, 26.96, 26.47, 26.24, 25.30 |
| Airmass term | 0.350, 0.150, 0.100, 0.040, 0.030 |
| Color term | 0.241, 0.148, 0.000, 0.083, 0.050 |
| Color (Instrumental to SDSS system) (SDSS mag.) | u*-g' g'-r' g'-r' r'-i' g'-z' |
| Dark sky brightness @ zenith - Moon 0% | 22.70, 22.00, 21.30, 20.30, 19.40 (mag / arcsec^2) |
| Grey sky brightness @ zenith - Moon 30% | 21.20, 21.30, 20.80, 20.30, 19.40 (mag / arcsec^2) |
| Bright sky brightness @ zenith - Moon 60% | 19.70, 20.50, 20.40, 20.30, 19.40 (mag / arcsec^2) |
| Point source MagAB SNR=10 Dark 1hr 0.8" | 25.10, 25.40, 24.80, 24.20, 23.20 |
| Point source MagAB SNR=10 Grey 1hr 0.8" | 24.40, 25.10, 24.60, 24.20, 23.20 |
| Field galaxy MagAB SNR=10 Dark 1hr 0.8" | 24.60, 24.90, 24.30, 23.70, 22.70 |
| Field galaxy MagAB SNR=10 Grey 1hr 0.8" | 23.90, 24.60, 24.10, 23.70, 22.70 |
| Transition from AB to Vega magnitude system | -.346, +.092, -.171, -.401, -.554 (mag) |
| CFH12K narrow band filters (~42x28 arcmin^2 FOV) | Halpha, HalphaOFF, TiO, CN, Hbeta, HbetaOFF, OIII |
| Camera |
|---|
| Exposure overhead | ~40 seconds |
| Read noise | ~3 ADU |
| Digital range | 65536 ADU |
| Raw fringe amplitude | ~6% in i', ~15% in z' |
| Observing |
|---|
| Typical exposure time (second) | 300 |
| Minimum exposure time (second) | 1 |
| Filter exchange time (second) | 90 |
| Observing mode | Exclusively Queued Service Observing (QSO) |
| Data pre-processing | Elixir at CFHT |
