From my backyard blind.
K-3 and Tamron SP AF 300mm 2.8 LD [IF] and F 1.7x AF Adapter (510mm, ƒ4.5)
(there's an F 1.7x in the market place at a great price.)
640 ISO, ƒ5.6 AV (1/160s to 1/500s)
Using primes you have to guess what you are going to shoot. Right now I have a hundred or so Goldfinches out there.
When you set up for Goldfinches, even a little downy woodpecker fills the frame.
And of course there were the prerequisite squirrels....
King Squirrel is back. He comes to the closest to me tree stump, climbs up and looks in the window at me. "Dude, is there going to be peanuts today?" Unfortunately closer than minimum focusing distance.
And the second in command among squirrels at the far end of the feeder.