Optical Observations of Blazars: the Perugia Monitoring

In eight years, during the blazar monitoring program performed with the Perugia automatic telescope, we were able to collect about 20000 $BV{R}_c{I}_c$ photometric points, contributing to get knowledge on the optical flux history of many sources brighter than magnitude $V=17.0$. This intensive and constant optical monitoring is essential to perform studies and multiwavelength campains about this class of AGN. We illustrate our program and some examples of data and preliminary results.