  We have obtained WIYN and SOAR i' images of BL Lacertae objects (BL Lacs) and
used these to detect or constrain the flux of the host galaxy. Under common
standard candle assumptions these data provide estimates of, or lower bounds
on, the redshift. Our targets are a set of flat-spectrum radio counterparts of
high flux Fermi Large Area Telescope (LAT) sources, with sensitive spectral
observations showing them to be continuum-dominated BL Lacs. In this sample 5
of 11 BL Lacs yielded significant host detections, with standard candle
redshifts z=0.13-0.58. Our estimates and lower bounds are generally in
agreement with other redshifts estimates, although our z=0.374 estimate for
J0543-5532 implies a significantly sub-luminous host.
