All Figures

Figure 1: Positions of the 4 VIRMOS fields on a dust map (Schlegel et al. 1998) of the sky (Aitoff projection in equatorial coordinates). The open squares are the center positions. One can see that the four fields are visible from CFHT as well as the ESO Paranal and the ESO La Silla observatories and are separated by at least 4 h, making the observations optimally spread over the nights and over the year. The square size is not exactly scaled according to the true field size ( ) to ease visualization. For comparison the open circles indicate the center positions of the CFDF fields (McCracken et al. 2001). The CFDF field sizes are 16 times smaller than the VIRMOS. The dust map was generated using the Skyview virtual observatory tools (http://skys4.gsfc.nasa.gov/).

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In the text

	Figure 2: Filter transmission and CCD quantum efficiency of the CFH12K camera used for the VIRMOS optical survey. The camera is composed of 9 epitaxial silicon (EPI) and three high restivity (HiRho) devices. Both devices have different quantum efficiency, as show by the long-dashed and short-dashed curves. The numbers indicate the CFHT reference number of the CFH12K CCDs.
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In the text

	Figure 3: Image quality FWHM measured on point sources for all survey images acquired in B ( top left), V ( top right), R ( bottom left), I ( bottom right).
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In the text

	Figure 4: Illustration of the final BVRI and -images generated for the VIRMOS "deep'' survey. The -image is deeper and show sharper detections than the individual filter images. Each image is  arcmin2.
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In the text