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We have conducted  VI  CCD photometry of the two open clusters NGC 1245 and NGC 2506 using the CFH12K CCD camera. Our photometry covers a sky area of 84 × 82 and 42 × 81 arcmin 2  for the two clusters, respectively, and reaches down to  V  ≈ 23. We derived the physical parameters using detailed theoretical isochrone fittings using χ 2  minimization. The derived cluster parameters are  E ( B  −  V ) = 0.24 ± 0.05 and 0.03 ± 0.04, ( V  −  M   V  ) 0  = 12.25 ± 0.12 and 12.47 ± 0.08, age (Gyr) = 1.08 ± 0.09 and 2.31 ± 0.16, and [Fe/H] = −0.08 ± 0.06 and −0.24 ± 0.06, respectively, for NGC 1245 and NGC 2506. We present the luminosity functions of the two clusters, which reach down to  M   V   ≈ 10, and derive mass functions with slopes of Γ = −1.29 for NGC 1245 and Γ = −1.26 for NGC 2506. The slopes are slightly shallower than that of the solar neighbourhood, implying the existence of dynamical evolution that drives the evaporation of the low‐mass stars in the clusters.

Deep and wide photometry of the two open clusters NGC 1245 and NGC 2506: CCD observation and physical properties