We present a progress report for the ongoing study of the globular cluster (GC) system around the edge-on lenticular galaxy NGC 3115. This object is one of the best targets for this kind of investigation, due to its proximity (~ 10 Mpc) and favourable inclination (for a deep photometric study and a review of the properties of NGC 3115, see Capaccioli et al., 1986). Previously published data include a preliminary luminosity function of GC candidates, based on indirect calibration of KPNO photographs (Strom et al., 1977), and visual star counts on CFH and AAT deep plates (Hanes and Harris, 1986). Here we report on B-band photometry down to mB ~ 24, based on CCD calibration.