[davidmanze]

dave, did you ever try the 100-400? Today Tamron just released a new firmware for it, so I'm really looking forward to update my lens. I also have the 150-600, but the shorter one I do take more often (although it's not enough FL for small birds, but that goes as well for 600 - the smaller the bird, the longer the FL should be).

   I spend too much time cropping to think about going to a shorter zoom range..........

   ...........but it does look like another good lens.........

     ........probably ideal for Florida......where the birds have very little fear of humans.....