The Tamron 150-500mm F5-6.7 Di III VC VXD is a well-built super-telephoto zoom that sits alongside Sigma's 100-400mm F5-6.3 lens as well as Sony's own 100-400mm F4.5-5.6 and 200-600mm F5.6-6.3 options. We took it out and about in Seattle in search of wildlife and textures – take a look at how it performs on Sony's high-res a7R IV.