Hand held? That's a really good shot and with nice composition too. I'm presently getting familiarised with a 55B version of that lens and have yet to get work out how to steady enough hand-held. Mine is on a crop sensor (Sony) so it's even more critical that it be kept steady, hence a monopod that converts to a hiking pole was acquired to ensure the lens had some help when needed. Any tips for getting bird-in-flight shots with a mirror lens?