grip gives fps boost on 5D3 to 6.7-6.9fps????????

[awinphoto]

this is news....?? oh. well, had i known that this spec wasn't out i would have confirmed it sooner...

at a Hands-on Prevew event that i attended last week for the 5D Mark III a Canon Australia rep did indeed state that the grip boosts the fps to 6.9. it's a fact, not a rumor. why it isn't in the specs anywhere is beyond me as i am sure the Canon rep knew what he was talking about as he had just returned from 5D Mark III training in Japan.

I think it's called being a good used car salesman... smells fishy to me

[moreorless]

My guess is the rumour originally surfaced to explain the difference between the rumoured 7fps and the actual 6fps.

Has anyone actually timed the 5D mk3? perhaps its somewhat faster than 6fps but Canon were unwilling to over estimate and label it at 7fps?

[WillShootPhotos]

My guess is the rumour originally surfaced to explain the difference between the rumoured 7fps and the actual 6fps.

Has anyone actually timed the 5D mk3? perhaps its somewhat faster than 6fps but Canon were unwilling to over estimate and label it at 7fps?

Um, yes - two posts earlier in this thread: http://www.canonrumors.com/forum/index.php?topic=4512.msg129235#msg129235

6.0 sec on the nose for both gripped and un-gripped.

The discussions I'd seen about the 7.0 fps (well - reported 6.8 fps w/ grip) were all credited back to various stories about having discussions with the ever ambiguous "Canon Rep" saying that the 6.0 was boosted to 6.9 with the grip...

The spec has pretty much always been reported (well - excluding rumors and speculation) as 6fps by canon in all their press releases, etc.

- Will

[LetTheRightLensIn]

My guess is the rumour originally surfaced to explain the difference between the rumoured 7fps and the actual 6fps.

Has anyone actually timed the 5D mk3? perhaps its somewhat faster than 6fps but Canon were unwilling to over estimate and label it at 7fps?

Um, yes - two posts earlier in this thread: http://www.canonrumors.com/forum/index.php?topic=4512.msg129235#msg129235

6.0 sec on the nose for both gripped and un-gripped.

The discussions I'd seen about the 7.0 fps (well - reported 6.8 fps w/ grip) were all credited back to various stories about having discussions with the ever ambiguous "Canon Rep" saying that the 6.0 was boosted to 6.9 with the grip...

The spec has pretty much always been reported (well - excluding rumors and speculation) as 6fps by canon in all their press releases, etc.

- Will

Speaking of rumors. For ages, some have claimed that only a large 1 series battery provides enough current to drive supre-tele AF at maximum speed. Others claimed that the difference was simply because the non 1 series bodies had slow AF chips and processing. Has anyone compared how fast a 5D3 can drive super-tele AF vs a 1D4/1D3/1DX? Another wild rumor was that the new grip cost more because they added the option to drive the batteries in parallel or that it would take optional 1 series battery pack. It's already been disproven (the 5D3 grip only allows the batteries to run in series and it won't accept any special batter packs). But I wonder, if they had allowed for that, if it would have sped up AF speed at all.

[Mt Spokane Photography]

If the batteries in the grip are in parallel, then the internal resistance would be lower, and under a high current drain, the voltage would be a little higher.  If the FPS is dependent only on the battery voltage, you might see a small increase.  Li-On batteries do have a internal resistance that is relatively high, so the voltage drops during high current output.
 
So its possible, and, thats probably why Nikon is able to get a higher FPS with dual batteries installed in the grip.

[neuroanatomist]

So its possible, and, thats probably why Nikon is able to get a higher FPS with dual batteries installed in the grip.

Except that apparently, with a trick/hack involving auto-bracketing, Nikon bodies can achieve that higher frame rate without the grip installed.

[LetTheRightLensIn]

So its possible, and, thats probably why Nikon is able to get a higher FPS with dual batteries installed in the grip.

Except that apparently, with a trick/hack involving auto-bracketing, Nikon bodies can achieve that higher frame rate without the grip installed.

Supposedly it only works when the battery is near full charge. Just what I read in one post. No idea if it's true.

I still wonder if the 1 series drives AF motors more quickly due to the big power pack thing is true or just some tall tale passed down. Anybody have say a 300 2.8 IS or 400 2.8 IS and a 5D3 and a 1D3/1D4/1DX around?

[Kernuak]

For what it's worth, when I went to the 5D MkIII demo back in March, the UK CPS rep said that the AF is quicker on 1 series cameras due to the higher voltage from the battery, but I haven't tested it either (I don't have either cameras ).

[neuroanatomist]

For what it's worth, when I went to the 5D MkIII demo back in March, the UK CPS rep said that the AF is quicker on 1 series cameras due to the higher voltage from the battery, but I haven't tested it either (I don't have either cameras ).

Chuck Westfall has stated that, as well.

[LetTheRightLensIn]

For what it's worth, when I went to the 5D MkIII demo back in March, the UK CPS rep said that the AF is quicker on 1 series cameras due to the higher voltage from the battery, but I haven't tested it either (I don't have either cameras ).

Chuck Westfall has stated that, as well.

In that case then why don't they make more intelligent grips like Nikon does? Why not a flip switch to toggle between in series and in parallel, or if that still won't work with basic batteries, then why not allow it to also take the full 1 series power pack as I believe the Nikon grips do? With the past non 1 series the AF logic chips may have been too slow to take much advantage anyway, but now that we have the same AF logic chips and logic in the 5 series why not make the more expensive 5D3 grip deliver something more than it just being a portrait mode grip?

[Marsu42]

For what it's worth, when I went to the 5D MkIII demo back in March, the UK CPS rep said that the AF is quicker on 1 series cameras due to the higher voltage from the battery, but I haven't tested it either (I don't have either cameras ).

Chuck Westfall has stated that, as well.

So people can now overclock their 5d3? Does water cooling help :-p ?

[Viggo]

Batteries in a Canon grip are used one after the other, not together. So it doesn't matter if you have one or two batteries in the grip (for fps). If they were used parallell you could pull out a higher current and lens drives and such would at least be faster, but they don't. They make you pay for the 1-series for that