I recently bought the Fuji 100-400 lens and decided to put it through the test at Fort Morgan near Gulf Shores. It has been a while since I have been all the way to the point. Years ago my brother and I would fish off the bank for speckled trout and redfish. This trip my main goal was to get pictures of the ghost crabs that dart back and forth along the beach.
This trip did not disappoint. Along with the crabs, there were herons, egrets, terns, and dolphins. The fuji 100-400 paired with a xt-1 was able to handle the wildlife and scenery around Fort Morgan. I am not one to use a tripod or monopod so being able to handhold is a must. The Image Stabilization comes in handy when I need to lower the shutter speed to keep my ISO from getting too high. The lens is big but not so heavy to make it burdensome for a two hour walk along the beach. I also used the 1.4 tc as well. To my eyes the the files are still sharp using the tc.
What I like about the lens and camera combo is the tilt screen of the fuji x-t1 and how relatively light the lens is. I was able to prop the combo on my foot and get low to the ground for some of the crab shots. I dislike sand so it is good to not have to get on my belly to get those kind of shots. Using the tilt screen I could see the view from the ground without having to get on the ground.
As the evening progressed I was witness to a great sunset over nearby Dauphin Island. I have not had a lens with the reach of 560mm in a long time so to see a sunset over water, with the benefit of seeing land on the horizon was neat. You could actually see the curve of the earth as the horizon blocked just a sliver of the land in the viewer.
In regards to autofocus, I would not put the performance in the league of a DSLR. However, it is acceptable to me. I think mirrorless is catching up to DLSR in this regard. The x-t1/100-400 is able to track flying birds reasonably well to the point I wasn't frustrated. All in all I really like the the 100-400 and looking forward to see how it performs on the x-t2 when it comes out.