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Thread started 09 Feb 2012 (Thursday) 04:44
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7D burst mode not hitting 8fps

 
Crafty
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Feb 10, 2012 08:45 |  #16

Do you have noise reduction turned on ? if so turn it off, fix it in pp.


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talbot_sunbeam
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Feb 10, 2012 08:48 |  #17

This is not the issue - read the thread that was linked to. The slowdown seems to be caused by the metering system in low light, nothing that you can change on the camera affects this - it's just how the 7D behaves at this point.

It's even mentioned in the manual.



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Tiberius
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Feb 11, 2012 23:27 |  #18

I gotta wonder WHY the 7D behaves like that. Is there some property of low light condition that prevents the camera from getting 8fps? Or is it deliberately crippled?


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hollis_f
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Feb 12, 2012 02:38 |  #19

Tiberius47 wrote in post #13871728 (external link)
I gotta wonder WHY the 7D behaves like that. Is there some property of low light condition that prevents the camera from getting 8fps? Or is it deliberately crippled?

It's because of the iFCL metering. Explained here (external link). This new metering system checks focus at each of the AF points before each shot. In conditions of very low light this process of checking takes long enough to prevent the camera shooting at 8fps.


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eosphotomanoftennessee
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Feb 12, 2012 17:32 |  #20

faster shutter speed = faster fps, duh?


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talbot_sunbeam
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Feb 12, 2012 17:34 |  #21

eosphotomanoftennessee wrote in post #13874999 (external link)
faster shutter speed = faster fps, duh?

No, even if you are in manual mode and have a, say 1/1000th shutter speed selected, if you are in low light, the fps slows down.

As has been said, it's to do with the metering system, and *nothing* else. In low light, the metering takes longer to process the scene and this slows the fps down. It's just how it is.

Page 93 in the 7D manual:
"In low-light areas or indoors, the continuous shooting speed may become slower even if a faster shutter speed is set. Duh*"

* I added that bit.



7D, 450D | 17-55, 10-22, 55-250, 50 1.8, 580EXII | YN568II | YN622 x3 | Magic Lantern | (Still) Jonesing for a 70-200 2.8...
Turns out a gripped 7D + 622 + 580exII + 70-200 2.8 IS MK2 is BLOODY HEAVY! Who knew?!!

  
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Feb 12, 2012 18:30 |  #22

Several things spring to mind here, that make me wonder about what Canon are doing with this. From what has been said here this seems to apply to all metering modes, in all exposure modes, and even when using lenses in MF mode. What dose it do with dumb MF lenses?
So even if spot metering is enabled it still dose this all focus points routine, so what dose it then do with the information? Throw it way? This metering technique makes sense to me in evaluative metering mode, but not in any other case, not even CWA. Outside of Evaluative I can understand them using the combined colour layers to find the correct luminance values where colour may be an issue but why still use the focus points on metering modes that are independent of focus points?

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Feb 12, 2012 19:02 |  #23

Do the burst in Live View. ;)

I was shooting the moon the other night with my 100-400 + 2x TC. Obviously can't use traditional AF so I switched over the live view to AF. Then I released the shutter and was pleasantly surprised to hear the thing go full speed.


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Feb 12, 2012 20:24 as a reply to  @ jwcdds's post |  #24

I did not take the time to read TeamSpeed's link in post #8 to see if this was mentioned, but the workaround for the metering bottleneck is to use exposure lock in Av, Tv, or P.




  
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Feb 13, 2012 05:40 |  #25

hollis_f wrote in post #13872283 (external link)
It's because of the iFCL metering. Explained here (external link). This new metering system checks focus at each of the AF points before each shot. In conditions of very low light this process of checking takes long enough to prevent the camera shooting at 8fps.

Interesting read, but I honestly fail to see how why that would even be an issue in situations where you are shooting in manual exposure and with manual focus...


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talbot_sunbeam
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Feb 13, 2012 06:22 |  #26

Tiberius47 wrote in post #13877489 (external link)
Interesting read, but I honestly fail to see how why that would even be an issue in situations where you are shooting in manual exposure and with manual focus...

We don't know how the camera is architected, or have access to the source code or hardware specifications. Clearly there is a reason, most likely a technical one. "Limitations" like these are hardly arbitrary, usually there is a good reason for it - we just don't know what it is.

Whatever the technical reason, it's just how it is, and if you absolutely need 8fps shooting in very dark places (which in general is always going to be difficult because of shutter speed requirements) and the 4fps you get in these conditions isn't good enough then maybe the 7D isn't for you.

The continuous frame rate also slows down if your battery is low too.



7D, 450D | 17-55, 10-22, 55-250, 50 1.8, 580EXII | YN568II | YN622 x3 | Magic Lantern | (Still) Jonesing for a 70-200 2.8...
Turns out a gripped 7D + 622 + 580exII + 70-200 2.8 IS MK2 is BLOODY HEAVY! Who knew?!!

  
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hollis_f
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Feb 13, 2012 08:22 |  #27

Tiberius47 wrote in post #13877489 (external link)
Interesting read, but I honestly fail to see how why that would even be an issue in situations where you are shooting in manual exposure and with manual focus...

Even in manual exposure the camera has to do metering - to display the exposure meter in the viewfinder. Does it have to do it between every shot at 8 fps? I doubt it.

It sounds like the sort of thing that could be easily fixed in firmware, but there are two reasons why that's unlikely to happen.


  1. The problem affects a vanishingly small number of users, probably too small to be worth bothering about.
  2. Canon don't want to make a firmware update that changes the functionality of a camera - even for the better. It'll set a precedent.

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chrisvanbeekum
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Feb 13, 2012 09:17 |  #28

you dont need 8 fps anyways . and yes in low light the burst rate drops


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Feb 13, 2012 09:42 |  #29

The precedent for altering firmware to better a camera was already done back with the 5D2, why stop now? :)


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7D burst mode not hitting 8fps
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