The 55-300 is excellent for its size, weight and cost. If you can manage the Sigma 150-500 or 50-500 they are much better, but cost much more and weigh a LOT more. The D-FA 150-450 is supposed to be even better, but costs a lot more. The DA* 300 is another more expensive option. A 500 mirror is very light, but hard to use. I got a few decent shots with my Tamron 500 mirror, but when I updated to the Sigma 150-500 I started getting a lot more keepers.
---------- Post added 01-02-17 at 01:31 PM ----------
Oh, with a long lens you'd probably benefit from adding a monopod as well.
---------- Post added 01-02-17 at 01:35 PM ----------
Originally posted by photoptimist Absolutely!
What's interesting is that with a little practice and experimentation, one can use the SR system to take 1/4 to 1 sec handheld pictures of waterfalls. For small falls and streams where one can get close to the rushing water, the amount of motion of the water is sufficient to create a decent sense of motion blur in the image. It might require a few shots at different shutter speeds to get a pleasing amount of motion in the water while the surrounding ground remains sharp, but it can be worth while to try.
I usually have a Gorillapod with me. If there is a handy tree etc. nearby it works well enough for waterfalls, and is easier to pack along. I wouldn't use it with a long, heavy lens, though.