Printable View
I read in one of the posts that the 1Dx will achieve a quicker autofocus time than the 5DIII because of the extra battery power.
This discussion I believe was in relation to the 85 1.2 which is known to autofocus slowly.
Question:
Will adding a battery grip to a 5DIII have an affect on the autofocus speed.
I realize that this is largely lens dependent but the idea of the extra power does beg the question.
Thank you.
I wouldn't think it so, but am not sure. Battery grips are more like gas tanks. It doesn't improve performance of a vehicle, just makes it go further down the the road. A 1dx has bigger pipes built in it compared to the others and allows it to gets more juice in to help move things around. That's my take on it anyway.
I too have read that the bigger lenses do AF a little quicker on the 1 series bodies because of more battery power. The reported reason is that the motor can move the big glass elements faster with more battery power. I think the 1DX and 1DMKIV batteries may actually have more current output in terms of mA not necessarily voltage. I am not certain but it seems that is what I have read. AF speed depends on many variables so it might be tough to tell the difference in a typical situation in the field.
For those curious from someone with to much equipment and time on his hands. With the 500mm f/4L shooting in single shot mode and single point, the 1D IV is significantly faster than the 7D and the 5D II is just a bit faster than the 7D.
While I do not have either the 5D III or the 85mm to test, I would speculate that a battery pack would make it a bit faster, never as fast as the 1D X. But battery power is not the only thing that the 1D X will have over the 5D III. I think processing power, firmware and possibly other factors will come in to play as well.
I am sure a battery pack wouldn't make it any slower.