UBR charge-coupled device photometry of Stromlo-APM galaxies

We present CCD photometry in the Johnson-Kron-Cousins UBR bands for a sample of 320 galaxies selected from the Stromlo-APM Redshift Survey. We use this CCD data to estimate the galaxy luminosity function in the U, B, R and b_J bands, finding consistent results with earlier work. Fainter galaxies serendipitously observed on our CCD frames allow a check of the photometric calibration of the APM Galaxy Survey. We find no evidence of any significant scale error in the APM magnitudes.