Thanks for the reply! Is it really a necessary limitation? There's firmware for the 5D Mark III which does allow AF at f8 so it's seems feasible for the 5D Mark II. Also, reports suggest that using 3rd party extenders allow the camera to ignore that limitation of f 5.6.
Asher
Diminishing the limitation is one thing, making the camera able to work is another... In previous Nikons you don't have the limitation put in software, Nikon just mentions that AF won't work at f8 and smaller, ...yet
IT DOES WORK if light is very good... but it is close to useless as hunting and inaccuracy increases by much and speed is much slower...
I suspect that Canon has set the limit to f5.6 to avoid having customers using it and then blaming Canon for the results... So, I guess that if you manage to exclude the limitation, it will be the same case... it will be able to work when light is very good, but the results will be worst than using MF..., just my 2 cents...
I am sure that Canon would have let the ability operative if the AF was capable to perform adequately, it's a good selling point Asher.