  We present deep CCD BVI photometry of the distant, old open cluster Berkeley
22, covering from the red giants branch (RGB) to about 6 magnitudes below the
main sequence (MS) turn-off. Using the synthetic Colour - Magnitude Diagram
method with three different types of stellar evolutionary tracks, we estimate
values and theoretical uncertainty of distance modulus mod0, reddening E(B-V),
age tau and approximate metallicity. The best fit to the data is obtained for
13.8 <= mod0 <= 14.1, 0.64 <= E(B-V) <= 0.65, 2 <= tau <= 2.5 Gyr (depending on
the amount of overshooting from convective regions adopted in the stellar
models) and solar metallicity.
