We present optical R band photometry of 3C 66A, 4C 29.45, ON 231 and 3C 345 from August 1997 to April 1999. Variability on long time scales in R band up to two magnitudes was found for 3C 66A and ON 231. The largest variation was observed for 3C 66A and equals to Delta(R)=1.90 (0.03) mag. Observational period includes the last great April 1998 outburst of ON 231 with overall amplitude 1.8 mag, IDV and IHV amplitudes are 0.82 and 0.2, respectively. 4C 29.45 and 3C 345 show variability of 1.6 and 1.02 mag.
Blazar Astrophysics with BeppoSAX and Other Observatories
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