Thanks for everyone's input and knowledge.
The shows are very quick, 4 minutes.
Originally posted by TER-OR Are you using back-button focusing? I've had luck just trying to follow a single subject AF.C and back-button while zooming in or out. You have to keep centered on a single subject, though, and then get shots as they appear.
Have never tried back-button focusing before. I have printed off the set-up instructions and will try it. I have a track and feild meet tomorrow and will see how it works. Can't image doing it with the 70 -200mm though. (Surppoting the lens with one hand, and the other hand on the shutter and back button.)
Originally posted by jatrax Practice?
Pentax is not noted to have the best tracking AF, but it can be done. You need to practice, practice though and use every advantage you can get. Try center point only and keep it on the subject, that might mean you have to crop some but that's what it is.
Center point and SEL works, it's the short amount of time that I have to put the focus point on their face, zoom, this will work as a: landscape or portrait and take the picture. Also, not cutting off body parts.
Pentax is not noted to have the best tracking AF :-(
Originally posted by LightBug Tamron lenses are not known to be fast autofocus lenses. Also, are you sure your shutter speed is fast enough to freeze the action and not be suffering from motion blur?
Yes, shutter speed it fast enough.
Who makes fast autofocus zoom lenses for low light action shots? Sigma?