I've been trying my luck recently for BIF photography and I have a question regarding auto focus points.
The last couple of times out, it's been clear blue skies and I figured having all the focus points active in AI Servo mode would increase my chances of getting an in focus shot.
There is nothing in the sky other than the bird so, there shouldn't be anything to pull the focus away from the bird.
Is having all the auto focus points active a good technique to use in this situation?
Or, should I be using centre point only and try my best to keep the centre point on the head area?
For the most part, a few of the focus points have been on the bird and I've gotten for me, what I consider, some half decent pictures considering the focal length of the lens being used. 70-200 f4 non IS on a 40D
The bird I've been shooting is an adult osprey and it's flown fairly close to me at times but, I can't quite get the eyes in as sharp focus as I would like.
I don't know if that's due to my technique/settings or the focal length limitation of the lens being used or, the combination of both.
The bird's head is generally well lit so I don't think lighting is an issue.
I'm gradually getting a base line for settings for this particular clear blue sky situation.
SS: Varies between 1600-800
FL:200mm for all pictures
Shoot in manual mode using BBF and high-speed continuous shooting.