**Table 1:** List of the eight blazar sources in the optical monitoring sample.
Object	Name	Class.	Filters	Observatory	$\gamma$ -detected	Comparison Stars
0219+428	3C 66A	BL Lac	BVRI	L,S	Yes	Fiorucci & Tosti (1996)^b
0420-014	PKS 0420-01	FSRQ	VRI	L,S	Yes	Smith & Balonek (1998)
0716+714	S5 0716+71	BL Lac	BVRI	B,L,S	Yes	Villata et al. (1998a)^a
0735+178	PKS 0735+17	BL Lac	VRI	L,S	Yes	Smith et al. (1985)
0851+202	OJ 287	BL Lac	VRI	L,S	Yes	Fiorucci & Tosti (1996)
1641+399	3C 345	FSRQ	VRI	L,S	No	Smith et al. (1985)^b
2200+420	BL Lac	BL Lac	VRI	L,S	Yes	Fiorucci & Tosti (1996)^b
2251+158	3C 454.3	FSRQ	VRI	L,S	Yes	Fiorucci et al. (1998)

$\textstyle \parbox{14cm}{ $^{{a}}$\space $I$ -data from Ghisellini et~al. (\cit... ...^{{b}}$\space Magnitudes from Gonz\'{a}lez-P\'{e}rez et~al. (\cite{Gonz2001}).}$

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