Roy C
Occasional bird snapper
Here is a better example of slow tracking sensitivity at work from yesterdays shoot.
The focus point is clearly over the shore/water line some 10 metres behind the bird but the bird is still sharply in focus because the slow tracking has not yet acquired focus. With the 40D it would have latched right on to BG.
EDIT: just seen Ian's post, one look at his great shots with the 7D and 400/5.6 in his BF gallery shows that the lens is well up to it.
The focus point is clearly over the shore/water line some 10 metres behind the bird but the bird is still sharply in focus because the slow tracking has not yet acquired focus. With the 40D it would have latched right on to BG.
EDIT: just seen Ian's post, one look at his great shots with the 7D and 400/5.6 in his BF gallery shows that the lens is well up to it.