A hummingbird that appeared right outside the back door after dinnertime one summer night a while before twilight started. I had on the 400mm f/3.5 ED~IF manual focus lens and the TC-301, the Nikon 2x teleconverter which made the lens into an 800mm f/7.7. Multiply that by 1.5x and I had a 1,200mm field of view and a manual focus lens with a 122mm front filter size...I could NOT actually "see" the bird because the damned lens front was so fricking large and the bird was CLOSE to me. The bird was just inside the minimum focusing distance, because I had to step two steps BACKWARD into the kitchen to get focus. I got off just two frames with my old Fuji S2 Pro, then the bird zipped away. Speed was obviously not enough to properly expose the image, but sort of stopped the wings.