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The Slit viewer is based on a scientific camera, equipped with one CCD EEV0520 (770 X 1152 frame transfer), a slit wheel with nine apertures and a movable turret. The wheel contains seven rejecting plates with the slits, an image slicers, one pinhole and one mirror. The movable turret contains a 1.2 mm diagphram to reduce of a factor 100 the stellar sources light and a blue filter in order to correct the source position for the atmospheric diffraction. The light entering in the spectrograph goes to the slit. The plate on the inside of the slit viewer reflects part of this light in the slit viewer camera while the remaining light goes through the slit into the spectrograph. The slit viewer allows this features: the centering of the objects in the slit; the focusing of the telescope.
The main characteristics of the EEV 05-20 are listed in the following table as taken from the EEV data sheet
| Pixel read out freq. | 20-1500 kHz |
| Output amplifier sensitivity | 2.0 mV/e- |
| Peak Signal | 300 ke-/pixel |
| Dynamic Range | 50,000:1 |
| Spectral Range | 420-1060 nm |
| R.O.N. | 6 e- rms |
| Image area | 770x1152 pixels |
| Image area | 17.3X25.92 mm |
| Pixel Size | 22.5 mm |
The Quantum Efficency of the chip, as measured by 
is shown in the figure.
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