  The question of whether or not the cosmological constant affects the bending
of light around a concentrated mass has been the subject of some recent papers.
We present here a simple, specific and transparent example where $\Lambda$
bending clearly takes place, and where it is clearly neither a coordinate
effect nor an aberration effect. We then show that in some recent works using
perturbation theory the $\Lambda$ contribution was missed because of initial
too-stringent smallness assumptions. Namely: Our method has been to insert a
Kottler (Schwarzschild with $\Lambda$) vacuole into a Friedmann universe, and
to calculate the total bending within the vacuole. We assume that no more
bending occurs outside. It is important to observe that while the mass
contribution to the bending takes place mainly quite near the lens, the
$\Lambda$ bending continues throughout the vacuole. Thus if one deliberately
restricts one's search for $\Lambda$ bending to the immediate neighborhood of
the lens, one will not find it. Lastly, we show that the $\Lambda$ bending also
follows from standard Weyl focusing, and so again, it cannot be a coordinate
effect.
