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Ok! its a short one really , Which Auto-focus should I use? It really depends on just what it is you are trying to do!
For example Birds in Flight (BIF) using the spot mode will cause you a lot of problems as you will need to keep the active sensor on the birds shoulder during the tracking event, to ensure you have the bird in focus at the release point. But if you set your focus option on either 9, 11, 21, 51 (however many sensors you have) once grabbed the other sensors should, using the predictive focusing system internally follow the bird as you track it through the event.
The one thing to do is practice on anything you can until it becomes second nature to select the correct focus mode automatically, this means you must know your camera controls so you do not have to repeatedly move your eye away from the viewfinder and action. Set your exposure refresh to short so you do not loose the focus to the background an annoying habit of auto focus..
Finally pick up your subject as far of as you can and track it in allowing the auto-focus time to lock and track and don’t stop to press the shutter, the bird won’t stop for you to do so, keep panning as you get a burst of, the law of averages you know!!
The background will dictate the sort of shot you get, try for blue sky overcast but bright is also good.
And overexpose by around .7 EV or you might end up with just a sharp silhouette. Have fun
Using Auto-focus
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