I was trying to decide between a 5-25 and a 4-16 ATACR for a new AR that's coming. I was assuming the 4-16 would have a larger field of view, but I called NF to confirm. To my surprise, the FOV at 16X on the 5-25 is actually bigger than the 4-16 at 16X. They called me back while I was driving so I didn't get the numbers written down, but it was on the order of 10 percent, IIRC.