This is a still from a movie. This car, piloted by a professional stunt driver, is coming toward me at about 70MPH and he makes one of those 180 degree turns. The road had to be watered down so the tires would skid as he wanted them to and not roll the car over. (check the lean of the car and the water where the tires make contact.
We did several takes. All were pleased with the results.
Rich, you seem to have mastered those hummers, and probably have shot enough GBH flight pics to know how the cookie crumbles there.
I have a suggestion for you:
(1) Stick with your MkIIN for now.
(2)Try to find some bird species in your neighbourhood which are (a) abundant and (b) not bigger than a duck. For example, Mallards or smaller ducks would do fine, starlings and house sparrows would be perfect.
(3) Photograph those birds in flight using your MkIIN. I mean, lottsa pictures...100-300 a day, depending on the opportunities.
(4) Come back here to discuss your experience with MkIIN application on BIF photography after you have:
(a) accumulated at least 20 keepers per bird species (or related species), and
(b) encountered MkIIN design performance limitations which you feel are hampering your keeper rate.
Have fun, because that's what the hobbies are about.
I think ai-servo function is best shown in a burst - here is 16 shot burst reposted from june of this year. Love my fixed MKIII. It was a bad focuser before the latest outer focus point fix of '09. This is what it is capable of now. This series was shot at f2.8 with a 300, centerpoint only.
Some AI Servo mk III shots for you since you asked: