>>2584523Actually the dust pump 100-400 IS. I rented it for an air show and had an extra day to take some bird pics for really the first time. The ISO was high because it was at the last 20-30 minutes of dusk.
It's my first go at a long telephoto - it's so fun. The IS is one of the earlier ones so it's not amazing but I do feel it helps in some situations.