How to get DOF on fast moving subjects
I used the DOF calculator online (DOFmaster) and used values I think I would use to take a photo of a peloton coming towards me.
Camera: FZ150 (they didn't have data for FZ200)
Focal length: 300mm (I figured I would would use half my zoom range to get close ups)
F/Stop: F8 (because I want as much DOF as I can get)
Subject distance: 200 feet
The calculator says my DOF would only be 10 feet, from 195-205 feet away. Yikes. I don't think my odds of snapping a photo right when the subject is in the 10 foot range is very high. And that probably explains my blurry photos...
Focal length: 50mm (no zoom, other values the same)
Now I get a 7000 foot window of focus. I can do that, lol! Would I be able to zoom in during PP for a desired close up --- and have it be in focus?
I have thought about using the 300mm focal length, but taking burst mode, and hoping the subject enters the 10 foot range while I am clicking away, but I think I would need to lower to 5mp/40fps or else I would lose the shot because the camera would be buffering any larger image. Or maybe I should take video and then pull a still out of that?
Do I understand this correctly -- that it is hard to get zoomed depth of field on fast moving subjects? Is there a best strategy?