Friend Kit came over with a Nikkor 300mm f/4 lens he had rented to let me try it out on my Nikon D600. It’s light, small, the autofocus is very fast. I like it, if I had $2K laying around doing nothing (which I don’t), I might want to buy one. Here’s a couple of shots I got around the house with it.
Lesser goldfinches on feeder
Stacy
Dagny's Desk 