September 02, 2015, 01:04:28 AM

Author Topic: 5DIII minimum shutter speed is not working  (Read 8894 times)

eninja

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Re: 5DIII minimum shutter speed is not working
« Reply #15 on: December 17, 2012, 08:37:49 PM »
So it's either a firmware bug or a bug in the "info" portion of the menu there. 

I expect it's neither, but functioning as designed. The footnote on p.128 of the manual indicates that if a correct exposure cannot be obtained at the max ISO of the selected range, a shutter speed lower than the chosen minimum will be used.  So, it seems to be intended as a 'soft' limit.

As pointed out above, for the 'min shutter speed in Auto ISO' available on the 5DIII, the 1D X has that setting, but also has 'hard' limits (lower and upper) that can be applied to shutter speed and aperture, which the camera will not override to get a correct exposure.

So, if you absolutely require a min shutter speed on the 5DIII, your best bet is probably to set the max allowable ISO at the top (or use Tv or M mode).

Also same scenario with 6D, Using Auto-ISO in Av mode, shutter speed is set to less than minimum shutter speed set WHEN auto-iso max out to get correct exposure.

I will try Manual Mode when I get home if this still holds.

Thanks.
6D and 70D. 24-70 F4L IS and 50 F1.2L

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Re: 5DIII minimum shutter speed is not working
« Reply #15 on: December 17, 2012, 08:37:49 PM »

eninja

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Re: 5DIII minimum shutter speed is not working
« Reply #16 on: December 18, 2012, 09:22:44 PM »
I have tried using M mode, to keep the shutter speed fix in auto ISO mode,
but new problem arises, I can not control the exposure, auto ISO set such that the exposure always come out standard/even or what the camera think is good exposure.

Now going back to Av Mode with auto ISO and must take note shutter speed every time.
6D and 70D. 24-70 F4L IS and 50 F1.2L

JenniferSvenja

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Re: 5DIII minimum shutter speed is not working
« Reply #17 on: March 22, 2015, 01:34:13 PM »
Hi everyone,
I found this old post and it seems to be dealing with kind of my problem. My Canon 5D Mark III just sometimes ignores my minimum shutter speed at low ISO e.g. ISO 400 both in P and Av Mode. Sometimes it works only in P or Av Mode, sometimes in both, sometimes in neither of them.
Iso is always set to AUto, My Max  Auto ISO is set to 12800. Instead of upregulating the ISO , it just upregulates the shutter time first. It makes pictures taken at not optimal super bright light just impossible. And i checked the safety shift, it is OFF. I don't know what to do. I just invested a huge sum into this camera and now such a simple thing is not working...... :'( Please help me with this issue.
« Last Edit: March 22, 2015, 01:42:04 PM by JenniferSvenja »

neuroanatomist

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Re: 5DIII minimum shutter speed is not working
« Reply #18 on: March 22, 2015, 01:40:05 PM »
Hi everyone,
I found this old post and it seems to be dealing with kind of my problem. My Canon 5D Mark III just ignores my minimum shutter speed at low ISO e.g. ISO 400.
My Max ISO is set to 12800. Instead of upregulating the ISO , it just upregulates the shutter time first. And i checked the safety shift, it is OFF. I don't know what to do. I just invested a huge sum into this camera and now such a simple thing is not working...... :'( Please help me with this issue.

To confirm, are you in Av mode with ISO set to Auto?
EOS 1D X, EOS M, and lots of lenses
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JenniferSvenja

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Re: 5DIII minimum shutter speed is not working
« Reply #19 on: March 22, 2015, 01:46:56 PM »
Hi everyone,
I found this old post and it seems to be dealing with kind of my problem. My Canon 5D Mark III just ignores my minimum shutter speed at low ISO e.g. ISO 400.
My Max ISO is set to 12800. Instead of upregulating the ISO , it just upregulates the shutter time first. And i checked the safety shift, it is OFF. I don't know what to do. I just invested a huge sum into this camera and now such a simple thing is not working...... :'( Please help me with this issue.

To confirm, are you in Av mode with ISO set to Auto?

Sorry, I realized later that I forgot to mention this and modified my question post.
 Yes, definitely: I tried both Av and P Mode. And ISO is set to Auto. And the awkward thing is, that sometimes it seems to be working after changing the minimum shutter time due to troubleshooting. But it always goes back to "not working" after some time.

neuroanatomist

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Re: 5DIII minimum shutter speed is not working
« Reply #20 on: March 22, 2015, 01:55:39 PM »
Hi everyone,
I found this old post and it seems to be dealing with kind of my problem. My Canon 5D Mark III just ignores my minimum shutter speed at low ISO e.g. ISO 400.
My Max ISO is set to 12800. Instead of upregulating the ISO , it just upregulates the shutter time first. And i checked the safety shift, it is OFF. I don't know what to do. I just invested a huge sum into this camera and now such a simple thing is not working...... :'( Please help me with this issue.

To confirm, are you in Av mode with ISO set to Auto?

Sorry, I realized later that I forgot to mention this and modified my question post.
 Yes, definitely: I tried both Av and P Mode. And ISO is set to Auto. And the awkward thing is, that sometimes it seems to be working after changing the minimum shutter time due to troubleshooting. But it always goes back to "not working" after some time.

It won't apply in P, only Av.  As light dims, shutter speed should increase to your set minimum, and only then should ISO rise to your maximum, and after that the shutter speed will start to increase again. 

What shutter speed do you have set as your min shutter in Av mode?
EOS 1D X, EOS M, and lots of lenses
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Re: 5DIII minimum shutter speed is not working
« Reply #20 on: March 22, 2015, 01:55:39 PM »