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Thread started 16 Aug 2012 (Thursday) 13:26
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7D - Manual mode, auto ISO exposure comp

 
rounder_09
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Aug 16, 2012 13:26 |  #1

Applogies if this has been discussed, I couldn't find any dedicated threads post v2 firmware.

With the ISO limit feature enabled, I was excited to try the auto ISO.

However, was quickly disappointed to see that I couldn't increase te exposure compensation in manual mode.

So I ask you all this... How would you handle this situation:

-shooting fast moving subject, so want shutter at 1000
-also wanted to control lens softness / depth of field, and prevent it from opening right up. So set app to 5.6.
-would love ISO to auto expose, but can't expose "to the right" in manual mode since you can't adjust the exposure compensation

So what do the pros suggest in these kind of conditions?

I realize I could dial in the ISO on the higher side, and fix the shutter speed, and which will ensure the lens doesn't open too wide. But that would waste light :). But wondering if I'm missing any other suggestions?

Thanks in advance!


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stsva
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Aug 16, 2012 13:33 |  #2

rounder_09 wrote in post #14866793 (external link)
Applogies if this has been discussed, I couldn't find any dedicated threads post v2 firmware.

With the ISO limit feature enabled, I was excited to try the auto ISO.

However, was quickly disappointed to see that I couldn't increase te exposure compensation in manual mode.

So I ask you all this... How would you handle this situation:

-shooting fast moving subject, so want shutter at 1000
-also wanted to control lens softness / depth of field, and prevent it from opening right up. So set app to 5.6.
-would love ISO to auto expose, but can't expose "to the right" in manual mode since you can't adjust the exposure compensation

So what do the pros suggest in these kind of conditions?

I realize I could dial in the ISO on the higher side, and fix the shutter speed, and which will ensure the lens doesn't open too wide. But that would waste light :). But wondering if I'm missing any other suggestions?

Thanks in advance!

You've pretty well captured why I don't bother with Auto ISO when shooting in Manual. Others more knowledgeable than me can chime in, but I'm not sure there's a way to get the Auto ISO to do anything other than try to produce a "middle of the exposure meter" image, based on whatever metering mode you're using.


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Aug 16, 2012 13:37 |  #3

I've wondered about this case in the past too. In the past, I've done something like this: in manual to get settings -> For you, 1/1000 at 5.6, then set ISO for an exposure to the right in a bright area of your scene. Then go set your minimum ISO at that value, switch to TV at 1/1000. It should keep aperture at 5.6 or less.

I'm interested in the pro solutions as well.

In most of my sessions, lighting isn't changing enough to put me out of manual for everything.


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Aug 16, 2012 13:39 |  #4
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Auto ISO logic differs on differ bodies ..
I used it on 5D M II and was pleased with it on sunny days in Byrce and Zion NP.
You might wish to consider manual ..


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stsva
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Aug 16, 2012 13:58 |  #5

EL_PIC wrote in post #14866856 (external link)
Auto ISO logic differs on differ bodies ..
I used it on 5D M II and was pleased with it on sunny days in Byrce and Zion NP.
You might wish to consider manual ..

Manual what . . . ?


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Aug 16, 2012 14:02 |  #6

This thread may interest you:

https://photography-on-the.net …/showthread.php​?t=1217769


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stsva
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Aug 16, 2012 14:10 |  #7

joeblack2022 wrote in post #14866968 (external link)
This thread may interest you:

https://photography-on-the.net …/showthread.php​?t=1217769

This seems to confirm the OP's issue, which is lack of an "exposure compensation" function for Auto ISO when using it in Manual shooting mode.


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Aug 16, 2012 16:28 |  #8

Until Canon introduces a way to do this, there is no good way to do it on any body. The latest 1D series offer an AE microadjustment that can act as EC in a pinch though.

What I don't understand is why Canon simply doesn't add the following logic to the camera...

If in M mode, and ISO is set to Auto, then the light meter switches back to the EC meter it is in Av or Tv, and enable EC, otherwise it stays a light meter....


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rounder_09
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Aug 16, 2012 17:28 |  #9

Thanks all - thought I might be missing something, but sounds like not.

TeamSpeed wrote in post #14867536 (external link)
If in M mode, and ISO is set to Auto, then the light meter switches back to the EC meter it is in Av or Tv, and enable EC, otherwise it stays a light meter....

Totally agree, seems like there are a tonne of ways to handle it. As it stands now, in those settings it isn't even a particularly valuable light meter. I assume that all it will tell you is when the scene doesn't have enough light for your max ISO (when in Auto ISO). Other than that, it will just be right in the middle :)

Too bad really... as I'd love that feature. I'm more concerned about shutter speed and aperture when shooting. If high ISO is required, I can clean it up later. Rather get the shot I want first.

Oh well....


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Aug 17, 2012 04:10 as a reply to  @ rounder_09's post |  #10

It's more understandable with the lower-end bodies, since they don't have three command dials. They don't have any +/- button to convert a dial to EC setting either.
Since M mode with EC will require adjusting three values, this causes a handling problem there.
But the 1D bodies also have a +/- button, so there it would be easy to have one dial for shutter speed, the other for aperture and then convert a dial to EC by first pressing the +/- button.


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Yogi ­ Bear
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Aug 18, 2012 16:10 |  #11

rounder_09 wrote in post #14866793 (external link)
.......Snip......

So I ask you all this... How would you handle this situation:

-shooting fast moving subject, so want shutter at 1000
-also wanted to control lens softness / depth of field, and prevent it from opening right up. So set app to 5.6.
-would love ISO to auto expose, but can't expose "to the right" in manual mode since you can't adjust the exposure compensation

So what do the pros suggest in these kind of conditions?

I realize I could dial in the ISO on the higher side, and fix the shutter speed, and which will ensure the lens doesn't open too wide. But that would waste light :). But wondering if I'm missing any other suggestions?

Thanks in advance!

How about this: Av Mode, Av = f/5.6, adjust ISO to give Tv = 1/1000, EC = +2/3. Hmmm?


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Aug 19, 2012 15:46 |  #12

Yogi Bear wrote in post #14875347 (external link)
How about this: Av Mode, Av = f/5.6, adjust ISO to give Tv = 1/1000, EC = +2/3. Hmmm?

Sure, if you have time to fiddle with the settings. The advantage, and potential value, of a true Auto-ISO mode (which Canon does not have) would be to set aperture and shutter to the settings you want, and deal quickly and automatically with changing light conditions by letting the camera select ISO. This is what Av and Tv modes do by letting the camera select aperture and shutter speed, respectively.

If you have time to meter and change settings, then no auto mode makes much sense given the degree of control you have in Manual. However, without the ability to dial in EC, as you can in Av and Tv modes, my 7D is going to consistently underexpose by about 2/3 stop when I us Manual mode with ISO set to Auto. A true Auto ISO mode would seem to be easy to add, but as it stands now, the OP has identified one way in which Canon DSLRs are broken.


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Aug 19, 2012 17:06 as a reply to  @ pknight's post |  #13

Is it any diffrent on the Nikon bodies?
Because of the lack of ec i seldom use auto iso


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7D - Manual mode, auto ISO exposure comp
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