Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus
I recently upgraded from a prime 400 5.6 to the 100-400 4.5-5.6. Many of my shots have a bokeh with parallel lines in it. Trying to figure out why. I have a UV filter on, not a polarizer, which was my first thought. I have not tried without a fi...