  We have derived R-band host galaxy fluxes of 20 TeV candidate BL Lacertae
objects as a function of aperture radius and FWHM. The results are given as
correction tables, that list the fluxes (in mJy) of all ``contaminating''
sources (host galaxy + significant nearby objects) as a function of aperture
radius and FWHM. We found that the derived fluxes depend strongly on aperture
radius, but the FWHM has only a minor effect (a few percent). We also discuss
the implications of our findings to optical monitoring programs and potential
sources of error in our derived fluxes. During this work we have also
constructed new calibration star sequences for 9 objects and present the
finding charts and calibrated magnitudes.
