In eight years , during the blazar monitoring program performed with the Perugia automatic telescope , we were able to collect about 20000 BVR _ { 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 .