Emperor Falls is the largest (50m tall) and best known waterfall on the Robson River in Mount Robson Provincial Park. It is located a short distance downstream of and southwest from the outlet of Berg Lake.
Photo tips: Various time of day can work here, certainly dawn or dusk, sunset, or some time in the morning, when the Sun peeks from behind the Mount Robson might result in a nice composition. You'll need a fairly wide-angle to capture the waterfall together with Mount Robson, about 20-24mm, but there are also other compositions possible.
Getting there: At about 3/4 of the Berg Lake Trail (about 15km from trail-head) turn right to a short side-trail and after about 300m you'll see the waterfall.