I just got back from a local park, shooting marshy areas and it was the first time I used my filters. Almost right above me, 3 assorted birds of prey and two large vultures began circling my H. They didn't get too close, but was right in the frame a bunch of times circling or flying through it. Taking the footage home, I could see that the filter dropped my shutter speed to the point where they were just blurs. AAAAAAAAAAAAHHHHHHHHHHHHHHH