Karl Gnter Wnsch
Forum Pro
Why? You get pictures that are at least 10 stops underexposed - so why bother shooting 8 of those per second?
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Karl Günter Wünsch
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7D high-speed shooting not working
- Thread starter keane_
- Start date
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- canon eos 7d
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regards
Karl Günter Wünsch
Sorry, I'm not sure what you're getting at, I haven't posted any photos and you're saying they're underexposed garbage? How did you work that out?
Karl Gnter Wnsch
Forum Pro
Because the slowdown due to the metering method is limited to situations where you wouldn't be able to achieve 8fps without grossly underexposing the shot anyways...
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Karl Günter Wünsch
Karl Gnter Wnsch
Forum Pro
Shutter life is rated at 150,000 - shoot at 8 fps for 6 hours and the shutter had it...
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regards
Karl Günter Wünsch
My photos are exposed just fine. Sorry if this irks you.
curlyone
Leading Member
Iam sure you need the battery grip to shoot 7 fps,dont know your setup,
i think its in manual somewhere.
i think its in manual somewhere.
This is not the case, 8FPS does not require the grip.
Karl Gnter Wnsch
Forum Pro
The 7D is not a Nikon ripoff that need the battery grip for full speed, the 7D can do 8 fps nicely without any such appendix..
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regards
Karl Günter Wünsch
Matt105483
Senior Member
Why do the Nikons need the grip? Dees the camera need the extra power or what is the technical reason?
curlyone
Leading Member
If not the phographer,not the grip for the extra battery,it could be the shutter
speed, i think DPRVIEW used 1/640 shutter speed to test the camera for 8 FPS
speed, i think DPRVIEW used 1/640 shutter speed to test the camera for 8 FPS
Severian The Lame
Leading Member
This issue came up in a thread a month or so ago.
http://forums.dpreview.com/forums/readflat.asp?forum=1019&thread=40153794
Let me quote myself from that thread:
http://forums.dpreview.com/forums/readflat.asp?forum=1019&thread=40153794
Let me quote myself from that thread:
Karl was a little less argumentative in that one. It was Christmas, after all.Perfectly reasonable assumption but wrong for the 7D. This appears to be a bug (or a feature if you like
So in High Speed drive mode if I AF and meter on a random target with the AF-ON button, lock exposure with a shutter half-press, then release the AF-ON button, and lastly fire the shutter: in P, Tv, and Av modes the drive will fire at 8 frames per second no matter what the light conditions are (provided of course that the shutter speed is high enough and the buffer doesn't fill); but in M mode the drive speed will vary with the lighting from a high of roughly 8 FPS with decent light to a low of a bit more than 4 FPS in the dark (literally). On the other hand, a similar slow down does not happen in Live View!
- Back-button AF; i.e., AF-ON button set to AF and metering start and shutter button disconnected from AF system. So the shutter release should be unaffected by AF considereations (as long as I'm not also pressing the AF-ON button)
- Manually set ISO. So metering associated with Auto ISO calculations shouldn't have any bearing on drive speed.
- Shutter button half-press set to AE lock. So once half-pressed or fully pressed exposure metering and calculations also should not have any bearing on drive speed.
- PQ set to full RAW with High Speed Noise Reduction and other such things all turned off. So (you'd think) light levels and ISO and consequently varoius kinds of in-camera processing shouldn't have any effect either.
I wasn't aware of this issue, but it's the only explanation that fits the facts, especially the difference in behavior between using the viewfinder and Live View. And as such, I think it can only be called a bug in the firmware. I can't think of a single good reason why this metering is required during a high speed burst. At the very least Canon should have included a Custom Function to disable it or to give priority to drive speed under these conditions.
tko
Forum Pro
It's been posted when the 7d first came out. Someone was complaining he couldn't shoot in the dark at 7 FPS. He was right I guess, but people wondered why he needed to do this
Anyhow, I guess there might be a legitimate need to shoot high speed in dim lighting, but I don't know why the 7d slows down. People tried everything, nothing seems to help. Mysterious. I doubt you are going to "fix" it.
Anyhow, I guess there might be a legitimate need to shoot high speed in dim lighting, but I don't know why the 7d slows down. People tried everything, nothing seems to help. Mysterious. I doubt you are going to "fix" it.
No proper fix but there is a workaround in shooting in live view or pressing the DOF button.
It's been posted when the 7d first came out. Someone was complaining he couldn't shoot in the dark at 7 FPS. He was right I guess, but people wondered why he needed to do this
Anyhow, I guess there might be a legitimate need to shoot high speed in dim lighting, but I don't know why the 7d slows down. People tried everything, nothing seems to help. Mysterious. I doubt you are going to "fix" it.
Karl Gnter Wnsch
Forum Pro
tko wrote:
but I don't know why the 7d slows down. People tried everything, nothing seems to help. Mysterious.
It the tie in between autofocus module and metering that's taking it's time because the autofocus module is out of it's full working range in such dim lighting (it is well below the lighting level at which you get 1/100 @ ISO 6400 @ f/2.8 because at that low light level I still could achieve - almost, 1/100 is too long a shutter speed for that - full speed without resorting to any tricks). The camera always evaluates all focusing points to give the metering algorithm the necessary data of where the subject is located - even in M.
There is a trick if you desperately want to ruin the shutter: Use Av mode and depress the AE-Lock button, then no metering will be performed and the camera will be able to rip though the full shutter life in about 6 hours at night...
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regards
Karl Günter Wünsch
but I don't know why the 7d slows down. People tried everything, nothing seems to help. Mysterious.
It the tie in between autofocus module and metering that's taking it's time because the autofocus module is out of it's full working range in such dim lighting (it is well below the lighting level at which you get 1/100 @ ISO 6400 @ f/2.8 because at that low light level I still could achieve - almost, 1/100 is too long a shutter speed for that - full speed without resorting to any tricks). The camera always evaluates all focusing points to give the metering algorithm the necessary data of where the subject is located - even in M.
There is a trick if you desperately want to ruin the shutter: Use Av mode and depress the AE-Lock button, then no metering will be performed and the camera will be able to rip though the full shutter life in about 6 hours at night...
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regards
Karl Günter Wünsch
Karl Gnter Wnsch
Forum Pro
It may be a technical reason, it may be purely a "we want to customer to pay us extra for it" reason..
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regards
Karl Günter Wünsch
Weird, what's your problem with shooting at 8FPS? Still think I'm going to kill my camera?
Karl Gnter Wnsch
Forum Pro
It's a fact, the shutter is rated to last an average of 150.000 shots, every second at 8 fps will take you 8 closer to a costly repair and all for nothing as under circumstances that are as dark as to trigger this behavior you can not achieve sufficient shutter speed that would allow 8 fps anyways. So why do you want to ruin your shutter for nothing worthwhile?
There are two considerations: You need sufficient shutter speed to achieve 8fps on one hand and you need sufficient lighting to have the camera not slow down due to the AF/metering coupling - both limits are quite close to each other with the shutter speed limit, even at highest ISO being the more stringent one. Or formulated differently: If you can achieve sufficient shutter speed for a properly exposed photo you won't experience a slowdown due to the AF/metering coupling! Only if you grossly underexpose the shots you will end up with that problem.
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regards
Karl Günter Wünsch
Yet again you're assuming my photos aren't worthwhile and are underexposed. They're not. I'm not ruining my shutter by shooting short 8FPS bursts.
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