  We present R- and V-band photometry of the gravitational lens system QSO
0957+561 from five nights (one in 2000 January and four in 2001 March,
corresponding to the approximate time-delay for the system) of uninterrupted
monitoring at the Nordic Optical Telescope. In the photometry scheme we have
stressed careful magnitude calibration as well as corrections for the lens
galaxy contamination and the crosstalk between the twin (A and B) quasar
images. The resulting, very densely sampled light curves are quite stable, in
conflict with earlier claims derived from the same data material. We estimate
high-precision timelag-corrected B/A flux ratios in both colour bands, as well
as V-R colour indices for A and B, and discuss the short time-scale variability
of the system.
