Canon 40D Burst Rate in AI Servo

It's very strange indeed, I may just have to live with it!

Harry

Have you compared line by line, the EXIF of a "gripped" image with the EXIF of an "non-gripped" and faster image? Its a long shot, but perhaps something is in the EXIF that mihht provide a clue.

I will give it a go but what should I be looking for I the exif?

HarryImp wrote in post #16641366
I will give it a go but what should I be looking for I the exif?

As i said its a long shot so I can't say for certain what to look for. If you compare line by line and see absolutely no difference, then it tends to support some form of grip issue, at least in my opinion. If you see differences in the EXIF, then perhaps that difference can yield a clue.

Sorry, I have made a mistake but it may be of more help. It works absolutely fine in A-dep mode, may this help identify the problem? The exif showed nothing!!

Even moe strange...A-DEP Mode is Automatic Depth of Field, or just Automatic depth. With A-DEP mode, you tell the camera which parts of your photo need to be in-focus, and the camera picks a corresponding aperturemthat hopefully will get everything in the range in focus. I could see this taking away processing power and hence slowing things down but you say this mode is the faster of the two??

Not that I've used A-DEP a lot, but I can't see how any continuous focusing would be possible in that mode. So it probably converts to One Shot AF, and in that mode the continuous drive mode works at the expected speed. For this user, that is.

HarryImp wrote in post #16638115
Hi all,
I have got a new 40D and just have a query. When I am on MF, everything is fine, as it is with One Shot or AI Focus. But when I use AI Servo, the burst rate drops by about half to around 3fps. Is this a fault or is this normal?
Thanks in advance
Harry

Hi there,

I hope you find your answer to this important question.

But let me warn you. These folks here at POTN are ruthless, barbaric, and will never let you off the hook for this sort of question.

TRUST ME!

Hahaha thanks, i am still no closer to finding the cause/solution to the problem

Harry

Levina de Ruijter wrote in post #16638463
Once upon a time one of POTN's own had the same problem. And became a legend...

https://photography-on-the.net/forum/showthre​ad.php?t=430473

Thanks for the memories

in AI servo, the camera will want to re-acquire focus after every shot, and that will cause a very expected delay

soccersnaps wrote in post #16641198
eh? how come youre not getting urrmmm one shot?

in that mode, it focuses once, and then will happily shoot until you let go or buffer fills, never refocusing again for any of the shots that follows the 1st one

LightRules wrote in post #16649054
Hi there,

I hope you find your answer to this important question.

But let me warn you. These folks here at POTN are ruthless, barbaric, and will never let you off the hook for this sort of question.

TRUST ME!

You forgot vicious and sadistic...

SMP_Homer wrote in post #16649735
in AI servo, the camera will want to re-acquire focus after every shot, and that will cause a very expected delay

Well, it depends. If the subject is well lit, has good contrast and doesn't move around much, like a black line on white paper in sunshine, then the camera is designed to be able to measure and update the focus setting in the time between the frames being exposed.
But if subject speed is high and/or erratic, contrast or lighting low, then it will most certainly slow down the frame rate.

I did sports photography with a 40D for two years, and my experience is that it definitely can keep the speed up in good conditions.

apersson850 wrote in post #16652004
But if subject speed is high and/or erratic, contrast or lighting low, then it will most certainly slow down the frame rate.

Yupe, that's my experience with AI-Servo also.