  New photometric follow-up observations of exoplanet transits of 'hot
Jupiters' TrES-3b and Qatar-1b are presented. Weighted mean values of the
solutions of light curves in R-fiter for both planetary systems are reported
and compared with the previous results. The transit light curves were analysed
using the WINFITTER code. The physical properties of the planets were
estimated. The planet radii are found to be $R_p = 1.381 \pm 0.033 R_J$ for
TrES-3b and $R_p = 1.142 \pm 0.025 R_J$ for Qatar-1b. Transit times and their
uncertainties were also determined and a new linear ephemeris was computed for
both systems. Analysis of transit times showed that a significant signal could
not be determined for TrES-3b, while weak evidence was found for Qatar-1b,
which might be tested using more precise future transit times.
