Great shots in this thread. I am thinking abut this lens for some bird shots. Anyone using this lens with the sigma adapter for Sony e and an a7r. Ha I realize the a7r is not right for this set up but it's the only body I have since I do mostly landscapes. I just want to try some birding and maybe the eagles this fall. I can pick up a used Canon 7d for a little more than the adapter or maybe a Sony a6ooo and the adapter if that would work?