Wife recently surprised me with the D500 and a Tamron SP 70-200mm f/2.8 Di VC USD ( A009N ). So far, I've not been able to get the lens to autofocus and I'm not sure if there is a camera setting I need to adjust in order to make it happen. I have the AF switch on both the lens and the camera,but no luck. I'm hoping for any info, tips, or suggestions. Thanks !