Sigma 100-400mm F5-6.3 DG DN OS

The Sigma 100-400mm F5-6.3 DG DN OS is an excellent telephoto lens for wildlife! It's smaller, lighter and less expensive than the Sony 100-400GM. That's an exceptional lens but I needed something smaller and lighter for wildlife photos and videos while backpacking. I hike with the Sony 24-70GM attached to my Sony a7Riv. When I