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Thread started 08 May 2011 (Sunday) 12:14
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7D fps question (sometimes not upto speed)

 
jvk
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May 08, 2011 12:14 |  #1

Hi,

I was shooting a game today and had trouble with my fps using the 7D.

I noticed that the camera is not always capable of shooting 8 fps even though the buffer is not even close to being full, shutter speed is 1/800+ and setting is set to 8 fps. I used zone af / al servo to focus. Noise reduction was off.

It doesn't always do that but only when i'm tracking moving subjects. Then it's unable to shoot 8 fps, i can clearly hear it's not 8 fps. (more like 3fps)

Anybody else experienced that? Why does it happen? Cant find it in the manual.

I have 1 theory but i want to here what you guys are thinking :) THX!


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Stuart ­ Leslie
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May 08, 2011 12:21 |  #2

When shooting soccer with my 40D I notice the fps slow down if I start wandering off the subject and the AF has to hunt for focus again- especially when the focus point is quite far from where subject was- like a fence behind the field which is what normally happens :)
Only other time it slows down is low light/ high ISO where I think a combination of slower focusing and image processing causes it.


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cormack
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May 08, 2011 12:25 |  #3

I sometimes find my 7d not shooting 8fps when the camera is not nearly level. Even with no lens on, when i face the camera down it does not achieve the 8fps.

Or when I am on manual focus, and in low low light, the camera does not get 8fps, with noise reduction off. I turn the light on, and it speeds up.


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gabebalazs
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May 08, 2011 12:53 |  #4

the fps depends on the available light (for 2 reasons, due to metering and also if the light is really low, and shutter speed is slow you can't "squeeze" 8 frames into one second.)
Also, if your battery is running low (1 or 2 bars) the fps drops to about 6-7 fps


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jwcdds
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May 08, 2011 12:53 |  #5

do a search. it involves the way the camera meters.


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macroimage
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May 08, 2011 14:17 |  #6

jvk wrote in post #12370495 (external link)
Cant find it in the manual.

The bottom of page 93 of the manual has some reasons listed. The bit about "depending on the lens used" is possibly what is happening. In AF servo mode, with a non-USM lens, shooting seems to slow down. Does it mostly happen with your 80-200mm lens?


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jvk
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May 08, 2011 14:35 |  #7

macroimage wrote in post #12371009 (external link)
The bottom of page 93 of the manual has some reasons listed. The bit about "depending on the lens used" is possibly what is happening. In AF servo mode, with a non-USM lens, shooting seems to slow down. Does it mostly happen with your 80-200mm lens?

Yes only, guess that's it then. Also found it in the manual. Thx, my guess was that the lens is to slow focussing. It doesn't let you take pictures while focussing so when when it has to refocus 8 times per second and is to slow doing that, it slows down.

Thx all btw for the fast respons. I'm debating wether to sell the 80-200 to fund a 70-200 (not the first time it crossed my mind, hard to sell the 80-200)


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macroimage
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May 08, 2011 14:41 |  #8

The 80-200L is a really nice lens. Do you really need five more pictures each second to get the "decisive moment" with that lens?

Your 28-135 usm should be able to get the eight frames per second in good light and 135 is pretty close to 200.


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Bendel
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May 08, 2011 16:26 |  #9

macroimage wrote in post #12371110 (external link)
The 80-200L is a really nice lens. Do you really need five more pictures each second to get the "decisive moment" with that lens?

Your 28-135 usm should be able to get the eight frames per second in good light and 135 is pretty close to 200.

Have you ever shot soccer or even seen a soccer field before?


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yourdoinitwrong
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May 08, 2011 19:37 |  #10

macroimage wrote in post #12371110 (external link)
The 80-200L is a really nice lens. Do you really need five more pictures each second to get the "decisive moment" with that lens?

Your 28-135 usm should be able to get the eight frames per second in good light and 135 is pretty close to 200.

I have only shot a few soccer games but I have shot plenty of other sports and I can assure you that 135mm is nowhere near being "pretty close" to 200mm.


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JeffreyG
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May 08, 2011 19:45 |  #11

yourdoinitwrong wrote in post #12372476 (external link)
I have only shot a few soccer games but I have shot plenty of other sports and I can assure you that 135mm is nowhere near being "pretty close" to 200mm.

Especially since 200mm is already too short to start with even on a 1.6X sensor, so now we go to 135 and have really, really really too short.

I shoot soccer all the time on 1.3X with a 100-400, and I use the range out to 400mm a lot.


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yourdoinitwrong
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May 08, 2011 19:57 |  #12

JeffreyG wrote in post #12372518 (external link)
Especially since 200mm is already too short to start with even on a 1.6X sensor, so now we go to 135 and have really, really really too short.

I shoot soccer all the time on 1.3X with a 100-400, and I use the range out to 400mm a lot.

That's pretty much why I don't shoot a lot of soccer, I just don't have the reach. I will be getting an extender for my 70-200 so that should help out. Luckily most of the kids in my family play baseball, basketball, and tennis so I don't need quite the reach as I would for soccer or football.


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jack880
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May 09, 2011 22:35 |  #13

jvk wrote in post #12370495 (external link)
Hi,

I was shooting a game today and had trouble with my fps using the 7D.

I noticed that the camera is not always capable of shooting 8 fps even though the buffer is not even close to being full, shutter speed is 1/800+ and setting is set to 8 fps. I used zone af / al servo to focus. Noise reduction was off.

It doesn't always do that but only when i'm tracking moving subjects. Then it's unable to shoot 8 fps, i can clearly hear it's not 8 fps. (more like 3fps)

Anybody else experienced that? Why does it happen? Cant find it in the manual.

I have 1 theory but i want to here what you guys are thinking :) THX!

The 7d has a custom function that tells the camera to give priority.to focusing rather than speed when using ai servo. You can change it to prioritise speed but then you might get more out of focus shots...


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apersson850
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May 10, 2011 02:03 as a reply to  @ jack880's post |  #14

Besides, that only makes a difference in difficult focusing situation. If the camera finds focus promptly, there's no difference between focus and drive priority.


Anders

  
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jack880
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May 10, 2011 14:01 |  #15

apersson850 wrote in post #12380886 (external link)
Besides, that only makes a difference in difficult focusing situation. If the camera finds focus promptly, there's no difference between focus and drive priority.

which would agree with what the OP is noticing...


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7D fps question (sometimes not upto speed)
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