  Kochanek (1992) suggested that the redshifts of gravitational lens galaxies
rule out a large cosmological constant. This result was questioned by Helbig &
Kayser (1996), who pointed out that selection effects related to the brightness
of the lens can bias the results of this test against a high lambda value;
however, we did not claim that the observations favoured a high lambda value,
merely that current observational data were not sufficient to say either way,
using the test as proposed by Kochanek (1992) but corrected for selection
effects. Kochanek (1996) pointed out that additional information (fraction of
measured lens redshifts) provides additional information which restores the
sensitivity of the test to the cosmological model, at least somewhat. Here, I
consider three aspects. First, I examine the accuracy of the correction to the
test proposed by Kochanek (1996). Second, I compare the slightly different
statistical methods which have been used in connection with this test. Third, I
discuss what results can be obtained today now that more and better-defined
observations are available.
