Still getting used to Canon after the switch from a D700 but got a couple question's if anyone can help. THE AF system is definately differrent from my D700. Both have their pros and cons imo but this 9 pt system is a bit differrent. 5DMK2 BTW.
1) In regards to the AF system If I am using a f/2.8 or faster lens is it optimal to use the center focus points and the invisible assist point directly on top and below the center point all within the center focus circle? Also if I am shooting vertical with my grip I would use the center focus point and then the invisible AF assist point to the left and right of the center focus point?
2) Since the center focus point is the "optimal" so I hear, in order to get the sharpest shots without always having your subject in the center is to focus from the center point and then recompose and frame differently (still same distance though)?
3) When using AI Servo mode do you Canon users use the Center focus point to hit your subject with and then while they move just keep your subject while moving somehow within that center circle hit by the center point and the 6 invisible assist points? Or do yall use all the AF points in AI Servo?
4) On my D700 and pretty much all the Nikon's, there is an AF assist illuminator next to the lens mount. On the 5DMK2 there is not one. I have the 580exII speedlight which has the AF assist beam. Is there a way to use the AF assist without firing the flash in low light situations?