The MOA cameras uses custom wide-band red and blue filters. Transmission data for these filters are available at Red filter and Blue filter.
On-line photometry of microlensing events alerted by MOA are available at the websites Alert2001, Alert2002 and Alert 2003.
Off-line photometry is available for selected events:-
HST image from 2000 of microlens event MACHO 98-BLG-35. In this image
the lens and the source are superimposed. In a few years they will diverge sufficiently to be
resolved, enabling the event to be better characterised.