09-24-2018, 09:27 AM
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).