Quote Originally Posted by neuroanatomist


So, based on the raw specs of the AF sensors, the lens(s) you have will impact which 1-series AF system is actually better for you (although that will be impacted by the benefit imparted by contributions from the metering sensor, no way to really quantify that). For example, I think you'd be better off with the 1D IV for your 300/2.8 + 1.4x, while Rick would be better off with the 1D X for his 500/4, unless he wanted to use it with the 2x TC, in which case he'd be better off with the 1D IV.


Head spinning yet? Mine is.....

I think the gains and losses will be only marginally noticed. But I havedecided that I am not going to pre-order the new 500mm or 600mm, or the 1D X. I am going to wait for the reviews.


Even thoughit only works with the supertele's, thespot focus on the 1D IV is superior to the 7D's IMO. The 1D IV puts the toggle function right at your fingertips on the big lenses, the 7D you had to go in and set the feature. I guess there is the possibility that I could have set a short cut for it, I didn't use the 7D long enough to figure out how.