zeteophoto

I have been waiting for this new 100-400 for years since I got my X-E1. With the Canon EF 100-400 w/ X-Mount adapter means you lost both AF and IS, which in the 400mm focal length you pretty much have to always use tripod. The DOF is just too shallow when wide open to properly handheld and have sharp focus. A slight move is enough to blur the image. On the other hand, with MF magnification peak & focus highlight on LCD or EVF it's easy to take sharp photos with MF lens on tripod. I've got lots of good sharp bird photos with my old Nikon MF 500mm F/4. So I guess it really depends on your photo subject. It would be very hard to do MF for bird in flight shot or sport/action short. On the other hand, you will probably do fine if your subject stay still (says birds at nest, super-moon shot, etc).