I recently purchased the 300mm F4 lens as I was finding occasions when a shorter focal length lens would be useful. The main use of the lens will be for flight shots of larger birds at relatively close range and also for smaller birds at close quarters.
I went to a private site in Cheshire where I knew I would be getting some close range shots for a variety of species to give it a test run. The weather was not great on the day but I was pleased with how the lens performed. It was a busy day!!!
Blue tit Chaffinch
GreenfinchNuthatch Pheasant Robin and Tree sparrow