Here are my recommendations for BIF;
TAv mode:
- Set aperture for sharpest MTF - f/5.6 with the DA*60-250, f/8 if you're also using the TC. I don't know about the Bigma, but I'd assume around f9.5.
- Shutter speed according to conditions. I find 1/1000s works most of the time. Don't be afraid to push ISO. Noise is correctable, motion blur is not.
AF-C focus mode, Hi-Speed continuous burst:
Center AF point, with 27 point expansion
For dark coloured birds, add 0.5EV compensation, fine tune in p-p
Turn off SR for panning. You could try the Bigma's panning mode, but not if you're on a tripod. Stabilization is not needed at these shutter speeds, so I would just leave it off.
Custom Menu Parameter Settings:
16. 1st frame action in AF-C - Focus priority (make sure focus is on the target before shooting, or you'll have a string of misses)
17. Action in AF-C Continuous - Focus Priority
18. Hold AF status - Low (bump up to Medium or High if there will be interrupted line of sight to the target.
The pelican was pretty close, these are only mildly cropped. The backlighting was a complication. This tern series was more demanding due to the distance and higher speed of the drop:
http://www.dpreview.com/forums/post/55076484
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Dan