1d Mark IV Drive Speed

I'm curious, has anyone compiled a list of the custom functions that can impact drive performance. I have some custom function set (unidentified) that is reducing my drive speed to about 8 frames per second. If I clear custom functions, then the drive speed returns to the expected 10FPS. If I set the AF parameters like I normally do, drive speed continues at 10FPS. Battery is fully charged. I shoot raw so ALO, Noise reduction, HTP shouldn't matter. There is ALOT of custom functions for me to go though 1 by 1 so I thought maybe someone has a list compiled already.

Thanks in advance

It's probably setting release priority to focus acquisition. The camera will wait to be in focus before releasing the shutter.

Most anything not related to focus can affect how quickly the buffer clears and fills, but will not change the burst speed.

For a quick confirm on my theory, set all of your funtions and then try a burst with the lens set to AF followed my MF. If the speed changes, it is clearly an AF related function.

The battery charge has no effect on fps.... It's a digital camera. The main CF that will slow it down is prioritizing focus over shutter release, or if you set crazy slow shutter speeds.

I haven't noticed any significant difference in FPS rate. There might be a split second for the first shot to lock focus but all following shots don't seem to be affected. Obviously setting different functions will impact the buffer capacity.

convergent wrote in post #15286854
The battery charge has no effect on fps.... It's a digital camera. The main CF that will slow it down is prioritizing focus over shutter release, or if you set crazy slow shutter speeds.

According to the manual, it does.

1D4 manual:
"When the battery level is low, the drive mode icon <Highspeed/Lowspeed/sin​gle shot> will blink. If the <Highspeed> icon blinks, the continuous shooting speed will decrease slightly."

Link to PDF of 1D4 manual:
http://www.bhphotovide​o.com/lit_files/13504.​pdf

From Canon website on the 1DX:

"The maximum continuous shooting speed is restricted to 10 fps when the battery charge is less than 50% or when ISO speed is above 32000. If the camera's internal temperature is low and ISO speed is above 20000, the maximum continuous shooting speed is restricted to 10 fps."
http://learn.usa.canon​.com …s/eos_1d_x/eos_​1d_x.shtml

Also stated in the 1D4 manual:
"In the AI Servo AF mode, the continuous shooting speed may become slightly slower depending on the subject and lens used"

JeffreyG wrote in post #15286671
It's probably setting release priority to focus acquisition. The camera will wait to be in focus before releasing the shutter.

Most anything not related to focus can affect how quickly the buffer clears and fills, but will not change the burst speed.

For a quick confirm on my theory, set all of your funtions and then try a burst with the lens set to AF followed my MF. If the speed changes, it is clearly an AF related function.

Most probably this. All cameras slow down fps based on release priority.

Easy to check, put lens on MF, single shot and see what kind of fps you get. It should be the max.

koala yummies wrote in post #15287176
According to the manual, it does.

If it does, then its got to be because of something to do with the focussing speed of the lenses. There is no logical reason why the body would slow down. Everything in it, except for the shutter, is digital... and will either work completely, or not at all. The shutter also can't "slow down" or the shutter speed wouldn't be correct.

convergent wrote in post #15287400
The shutter also can't "slow down" or the shutter speed wouldn't be correct.

Where did anyone in here say that it did? Every reference I made was quoted directly from Canon with links, the term Canon uses is "continuous shooting speed". The term 'shutter speed' or even the word 'shutter' isn't anywhere in my post.

convergent wrote in post #15287400
If it does, then its got to be because of something to do with the focussing speed of the lenses. There is no logical reason why the body would slow down. Everything in it, except for the shutter, is digital... and will either work completely, or not at all.

I quoted directly from the Canon manual and Canon website, the continuous shooting speed can be affected by the battery charge, you said 'the battery charge has no effect on fps'. I was pointing out that Canon has clearly stated otherwise. That was what my reply was about. Canon has clearly stated the stated continuous shooting speeds of a camera can slow down with certain battery charges, and certain lenses. It's all in those links provided by Canon. There is nothing to argue speculate or debate about here.

koala yummies wrote in post #15287619
Where did anyone in here say that it did?

I never said that you did say that. I said that. I was just trying to talk through why a digital camera would "slow down" in any way due to a battery not being at 100%. I'm not questioning what the manual says.. obviously I believe you if you say you are quoting the manual.

Having spent many years working in electronics, it makes no sense (to me) that the body would slow down. The only thing mechanical is the shutter, and it can't slow down as mentioned. Everything else is digital, not analog. Digital stuff doesn't usually slow down because of voltage changes. It either works or it doesn't. This is why I was speculating that possibly the motors in the lens are affected... but I thought they were digital stepping motors.

I guess its one of those things that makes you go "hmmmmm". I wonder to what degree this slow down happens... any indication in the manual if we are talking about changes that are so small as to not be perceived?

JeffreyG wrote in post #15286671
It's probably setting release priority to focus acquisition. The camera will wait to be in focus before releasing the shutter.

Most anything not related to focus can affect how quickly the buffer clears and fills, but will not change the burst speed.

For a quick confirm on my theory, set all of your funtions and then try a burst with the lens set to AF followed my MF. If the speed changes, it is clearly an AF related function.

I actually did that. It isn't related to AF as far as I can tell. With the camera in one shot the drive speed still is lower than it should be. Thanks for the suggestion though.

convergent wrote in post #15288694
I never said that you did say that. I said that. I was just trying to talk through why a digital camera would "slow down" in any way due to a battery not being at 100%. I'm not questioning what the manual says.. obviously I believe you if you say you are quoting the manual.

Having spent many years working in electronics, it makes no sense (to me) that the body would slow down. The only thing mechanical is the shutter, and it can't slow down as mentioned. Everything else is digital, not analog. Digital stuff doesn't usually slow down because of voltage changes. It either works or it doesn't. This is why I was speculating that possibly the motors in the lens are affected... but I thought they were digital stepping motors.

I guess its one of those things that makes you go "hmmmmm". I wonder to what degree this slow down happens... any indication in the manual if we are talking about changes that are so small as to not be perceived?

Metering has also been known to slow the drive speed down on the 7D. Battery charge on a number of bodies as well. Takes a good bit of juice to drive the shutter mechanism at full frame rate, capture the image, process it, write to the card and drive the lens motor I suppose. Anyway, I am still trying to uncover the mystery of mine.

jase1125 wrote in post #15286647
...If I clear custom functions, then the drive speed returns to the expected 10FPS. If I set the AF parameters like I normally do, drive speed continues at 10FPS...

Well if you have cleared the custom functions and reset the AF parameters and the result of this is a drive speed of 10fps, then surely you have solved the problem.

john crossley wrote in post #15290452
Well if you have cleared the custom functions and reset the AF parameters and the result of this is a drive speed of 10fps, then surely you have solved the problem.

What I mean is I configure the af parameters exactly the same when my max drive speed is about 8fps. Only clearing all of the custom functions restores 10FPS. Returning the af parameters to their default values does not.

jase1125 wrote in post #15292033
What I mean is I configure the af parameters exactly the same when my max drive speed is about 8fps. Only clearing all of the custom functions restores 10FPS. Returning the af parameters to their default values does not.

So which "Customm Functions" are you changing that make the drive speed drop to 8fps.

john crossley wrote in post #15294432
So which "Customm Functions" are you changing that make the drive speed drop to 8fps.

That is what I am trying to figure out