action. A slow shutter will incease the exposure and blur movement. These effects occur in each frame, so you may have to look closely to see them. A spinning airplane propeller is one thing that will show this effect. Bright, outside conditions facilitate high shutter speeds, but may also make it impossible to get very slow speeds unless you use a small aperture or the ND filter.
I admit I'm lost, and I know this is dumb, but after 4 practice tapes using the Canon XH-A1, I still can't see significant differences in the 24 - 30 fps or various shutter speeds. I am shooting in HD mode, viewing the DVDs on a SD tv, but footage will be used later to produce a Blu-ray product. For now: if you were shooting on mostly bright sunny days, water, with lots of action - (National Wildlife Refuges) other than paying attention to the ND filter, what settings would you instintively try first? I'm asking.
I'm 65, so maybe it's my eyes...but I'm not hanging it up. Not yet.