  Precise and frequent photometric follow-up studies of transit light curves
are indispensable when accurately characterizing extrasolar planets. We present
new multi-wavelength photometry of three transiting "Hot Jupiters", TrES-3b,
WASP-2b and HAT-P-30b (WASP-51b). Data were acquired from an 0.8 meter
telescope at Tarleton State University. When combined with literature data,
allowed us to redetermine system parameters in a corresponding way. We
developed GCX reduction pipeline and TAP, modeling and light curve fitting
package to analyze the extracted light curves. We then used weighted mean
results to estimate the parameters from BVRI filters for three exoplanetary
systems and compared them to previous results. We concluded our determined
parameters are agreed with previous studies. From our study, TreS-3b with a
mass of Mp = 1.773 Mjup and Rp = 1.305 Rjup appears slightly less massive,
while HAT-P-30b, which has a mass of Mp = 0.7006Mjup and Rp = 1.5109Rjup
appears to be a bloated "Hot Jupiter". Additionally, we compared the results of
our broadband photmetric analysis with the previous studies to search for
transit depth wavelength dependence. We found a flat spectrum across optical
wavelengths (except WASP-2b in R-band) for TrES-3b and WASP-2b, indicating the
presence of clouds in their atmospheres. ForWASP-2b, Rp/R* value was 0.14215
which was 0.14$\sigma$ higher than in the previous work. HAT-P-30b had a
significantly larger radius in B filter with Rp = 0.161246Rjup, resulting from
Rp/R* = 0.1334, which was secondarily confirmed by the atmospheric scale height
value, H = 1450km, indicating that HAT-P-30b is an inflated "Hot Jupiter".
