  Fields of Geminga, PSR B0950+08, PSR J1908+0734 and PSR J0108-1431 have been
observed within the program of optical investigation of nearby neutron stars
carried out with the 6m telescope. Our multicolour BVR_cI_c photometry has
yielded the following magnitudes of Geminga: V=25.3+/-0.4; R_c=25.4+/-0.3. The
estimates of the 3\sigma upper limits in the B and I_c bands are 25.4 and 24.9,
respectively. This is in agreement with previous observations of Geminga. We
have suggested candidate for optical counterpart of PSR B0950+08, with
R_c=25.4+/-0.3. When compared to the HST data obtained in UV its flux shows
that this old pulsar can be brighter in near-IR than in near-UV. We have
obtained for the first time images of the fields of PSR J1908+0734 and PSR
J0108-1431. Although no optical counterparts have been detected, the magnutude
upper limits obtained suggest further observations of these pulsars.
