HSTphot, a photometry package designed to handle the undersampled PSFs
found in WFPC2 images, is introduced and described, as well as some of the
considerations that have to be made in order to obtain accurate PSF-fitting
stellar photometry with WFPC2 data. Tests of HSTphot’s internal reliability
are made using multiple observations of the same field, and tests of external
reliability are made by comparing with DoPHOT reductions of the same data.