We present a weak gravitational lensing analysis of 815 square degree of
i-band imaging from the Kilo-Degree Survey (KiDS-i-800). In contrast to the
deep r-band observations, which take priority during excellent seeing
conditions and form the primary KiDS dataset (KiDS-r-450), the complementary
yet shallower KiDS-i-800 spans a wide range of observing conditions. The
overlapping KiDS-i-800 and KiDS-r-450 imaging therefore provides a unique
opportunity to assess the robustness of weak lensing measurements. In our
analysis, we introduce two new `null' tests. The `nulled' two-point shear
correlation function uses a matched catalogue to show that the calibrated
KiDS-i-800 and KiDS-r-450 shear measurements agree at the level of 1±4\%. We use five galaxy lens samples to determine a `nulled' galaxy-galaxy
lensing signal from the full KiDS-i-800 and KiDS-r-450 surveys and find
that the measurements agree to 7±5\% when the KiDS-i-800 source
redshift distribution is calibrated using either spectroscopic redshifts, or
the 30-band photometric redshifts from the COSMOS survey.Comment: 24 pages, 20 figures. Submitted to MNRAS. Comments welcom