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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 thedeep $r$-band observations, which take priority during excellent seeingconditions and form the primary KiDS dataset (KiDS-$r$-450), the complementaryyet shallower KiDS-$i$-800 spans a wide range of observing conditions. Theoverlapping KiDS-$i$-800 and KiDS-$r$-450 imaging therefore provides a uniqueopportunity to assess the robustness of weak lensing measurements. In ouranalysis, we introduce two new `null' tests. The `nulled' two-point shearcorrelation function uses a matched catalogue to show that the calibratedKiDS-$i$-800 and KiDS-$r$-450 shear measurements agree at the level of $1 \pm4$\%. We use five galaxy lens samples to determine a `nulled' galaxy-galaxylensing signal from the full KiDS-$i$-800 and KiDS-$r$-450 surveys and findthat the measurements agree to $7 \pm 5$\% when the KiDS-$i$-800 sourceredshift distribution is calibrated using either spectroscopic redshifts, orthe 30-band photometric redshifts from the COSMOS survey.

KiDS-i-800: Comparing weak gravitational lensing measurements in same-sky surveys