Decided I needed something longer before prices went up. This may well not be as good as the Nikon 80-400, but it probably focuses faster (AF-S, which the Nikon version doesn’t have). And it’s a lot cheaper.
I owned a 400mm lens with the Pentax system I had in college and after; a great big huge thing, f/6.3, and preset diaphragm (not automatic). This relatively cheap zoom ($750) is 120-400mm f4.5-5.6, with image stabilization. And it focuses down to a hair less than 5 feet.
And based on just a bit of preliminary play, it’s not half bad.
(If you look closely, you’ll see strange texture over the background. That’d be because this was shot through a dark rope net separating me from the eagle.)