| Focal Station | Nasmyth |
| Wavelength range | 0.9 - 2.5 microns |
| Optimization | 1.0 - 2.5 microns |
| Spectral resolution | 4000 for Z, J and H bands; 3500 for K band |
| Spectral coverage | One observing window (Z, J, H and K) per single exposure |
| Array format | Rockwell HgCdTe 2048 x 2048 |
| Scale at detector | 0.2 arcsec per pixel |
| Limiting magnitude | J=25.5, H = 24.5, K = 23.5 for S/N = 5; t = 4 hours |
| OH suppression | In software |
| Spectrograph temperature | 77 K |
| Multi-object selection | Multislit mask interchanger |
| FOV | 6 arcmin x 4 arcmin |
| FOV | 6 arcmin x 6 arcmin |
| Plate scale | 0.2 arcsec per pixel |
| Filters | Bands Z, J, H, K and K'; narrow band filters (to be defined) |