  In this paper we present results of applying the shear-ratio method to the
RCSLenS data. The method takes the ratio of the mean of the weak lensing
tangential shear signal about galaxy clusters, averaged over all clusters of
the same redshift, in multiple background redshift bins. In taking a ratio the
mass-dependency of the shear signal is cancelled-out leaving a statistic that
is dependent on the geometric part of the lensing kernel only. We apply this
method to 535 clusters and measure a cosmology-independent distance-redshift
relation to redshifts z~1. In combination with Planck data the method lifts the
degeneracies in the CMB measurements, resulting in cosmological parameter
constraints of OmegaM=0.31 +/- 0.10 and w0 = -1.02 +/- 0.37, for a flat wCDM
cosmology.
