Table 2: The sample and the journal of observationsa.

Name		 z V MB Filter $T_{\rm exp}$ Date FWHM Photometric?
        (s)   (arcsec)    
(1) (2) (3) (4) (5) (6) (7) (8) (9)

1ES 0229+200		 0.139 18.0 -21.7 U 2700 12/11/2004 1.7 Y
        B 900 12/11/2004 1.9 Y
        V 1800 12/11/2004 2.0 Y
PKS 0521-365 0.055 14.6 -22.3 B 480 14/03/2005 1.4 Y
PKS 0548-322 0.069 15.5 -22.0 B 900 15/03/2005 1.3 Y
1H 0706+591 0.125 19.5 -21.0 U 1600 27/01/2004 1.2 Y
        B 1500 27/01/2004 0.9 Y
        V 600 27/01/2004 1.2 Y
MRK 421 0.031 13.8 -22.9 U 900 08/03/2005 0.9 N
        B 300 08/03/2005 0.9 N
        H 150 25/03/2005 1.8 Y
MRK 180 0.045 15.0 -22.1 U 900 06/05/2002 1.2 Y
        B 1600 10/03/2003 1.2 Y
1ES 1212+078 0.136 16.1 -23.6 B 1800 08/03/2005 0.9 N
MS 1229.2+6430 0.164 16.9 -21.7 B 1800 10/03/2004 2.1 Y
1ES 1255+244 0.140 15.4 -24.3 B 1800 09/03/2005 1.9 Y
PG 1418+546 0.152 15.7 -23.7 U 900 07/05/2002 2.1 Y
        B 700 07/05/2002 1.3 Y
1ES 1426+428 0.129 16.5 -22.5 B 1600 10/03/2003 1.8 Y
1ES 1440+122 0.162 17.0 -22.9 B 1800 08/03/2005 0.9 N
AP LIBRAE 0.049 14.8 -21.7 U 700 07/05/2002 2.0 Y
        B 900 15/03/2005 1.1 Y
MS 1552.1+2020 0.273 17.7 -23.5 B 1200 09/03/2005 1.9 Y
MRK 501 0.034 13.8 -22.4 U 600 07/05/2002 1.2 Y
        B 240 08/03/2005 1.1 N
        V 180 08/03/2005 1.2 N
I Zw 187 0.055 16.4 -21.1 U 500 07/05/2002 2.0 Y
        B 900 25/09/2003 1.1 Y
        V 300 08/03/2005 1.3 N
3C 371 0.051 14.2 -22.6 U 1200 01/10/2000 2.1 Y
        B 3600 02/05/1997 0.8 Y
        V 480 08/03/2005 1.3 N
BL LACERTAE 0.069 14.7 -22.4 B 720 01/10/2000 2.3 Y
aColumn (1) gives the name of the BL Lac object; (2) the redshift; (3) the V-band apparent magnitude; (4) the B-band absolute magnitude; (5) the filter used; (6) the total integration time; (7) the date of the observation; (8) the seeing FWHM and (9) photometric (Y) or non-photometric (N) conditions.

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