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Occasional Contributor
Posts: 6
Registered: ‎11-03-2018

Problems with exposure

I have recently bought a new Canon 5D mark IV and am having problems with exposure.  I am using an older EF 24-105 lens. I have experimented with different metering modes and still seem to have the problem.  Two photos taken back-to-back with exactly the same settings and the same field of view have dramatically different exposures.  One will be just fine, the next completely blown out.  See an example below:

 

300A0017.JPG

ISO 320  1/400 sec f/14

300A0017.JPG

ISO 320  1/400 sec f/14

 

Any ideas, suggestions.  Am I doing something wrong or is there a problem with the camera and/or lens?

Honored Contributor
Posts: 7,881
Registered: ‎08-13-2015

Re: Problems with exposure

Are you using One Shot mode?  For this type of shot, I would use One Shot AF mode, and Single Shot drive mode.  

 

What metering mode are you using?  I find that Evaluative Metering works just fine for 99.99% of my handheld shots.  Sometimes trying to keep the metering system alive, you can inadvertently lock exposure.  One day I noticed that I had locked exposure after reviewing shots on the LCD.

 

 

What shooting mode are you using?  You should be able to see the bad exposures in the viewfinder display.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Honored Contributor
Posts: 7,881
Registered: ‎08-13-2015

Re: Problems with exposure

BTW, I think the first shot is under exposed.  The second shot is obviously overexposed.  Make sure the camera is not trying to  capture a set of HDR exposures.  You can either find the setting in the menus, or reset the camera back to factory defaults.

 

I think shooting at f/14 is unnecessary when shooting with a wide angle focal length.  With a focal length of 24mm, an aperture of f/8 should be sufficient.  This will allow you to raise the shutter speed.  I would want to use at least 1/1000 for these shots.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Reputable Contributor
Posts: 730
Registered: ‎11-14-2012

Re: Problems with exposure

[ Edited ]

My two thoughts:

 

1. stuck aperture

2. wrong EXIF

 

The first image has readable EXIF, the second one not. The second one is also a small image so it is hard to see any change in DOF.

 

BTW, your firmware is 1.0.4. Latest is 1.1.2.

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Valued Contributor
Posts: 343
Registered: ‎10-21-2016

Re: Problems with exposure

The 24-105 Mk 1 is prone to having a broken internal cable which can give intermittent focusing and/or aperture control. To check this put the camera into  M mode, look into the front of the lens, hold the DOF button in and change the aperture through all values, you should be able to see it change at each step. Try this at different zoom levels.

Honored Contributor
Posts: 7,881
Registered: ‎08-13-2015

Re: Problems with exposure


@Ray-uk wrote:

The 24-105 Mk 1 is prone to having a broken internal cable which can give intermittent focusing and/or aperture control. To check this put the camera into  M mode, look into the front of the lens, hold the DOF button in and change the aperture through all values, you should be able to see it change at each step. Try this at different zoom levels.


I am not totally convinced that the OP is using the EF 24-105mm f/4L IS USM.

 

That is good advice on how to test an automatic aperture.  It helps to use a tripod, or look into a mirror when you do it.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
VIP
Posts: 10,933
Registered: ‎12-07-2012

Re: Problems with exposure

"Any ideas, suggestions."

 

Yes, your lens did not stop down.  Simple.  Are you using high speed shooting mode?

 

Wait, wait, did I hear somebody say "light flicker"?  Smiley LOL

EOS 1DX and 1D Mk IV, even less and less other stuff.
Honored Contributor
Posts: 7,881
Registered: ‎08-13-2015

Re: Problems with exposure


@ebiggs1 wrote:

"Any ideas, suggestions."

 

Yes, your lens did not stop down.  Simple.  Are you using high speed shooting mode?

 

Wait, wait, did I hear somebody say "light flicker"?  Smiley LOL


No, you did not.  You’re hearing voices in your head again.  Smiley Very Happy

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Occasional Contributor
Posts: 6
Registered: ‎11-03-2018

Re: Problems with exposure

I was using M - manual shooting mode for these shots and high speed continuous shooting.  But it doesn't matter.  I have the same problems on P (program) and without continuous shooting.  One shot will look fine and then the next shot (same settings, same subject matter) is completely over exposed.  Really frustrating!

VIP
Posts: 10,933
Registered: ‎12-07-2012

Re: Problems with exposure

"One shot will look fine and then the next shot (same settings, same subject matter) is completely over exposed."

 

How often does this happen?  Once in a long while, I will say nothing is wrong. Otherwise you may want to have Canon look at it.

EOS 1DX and 1D Mk IV, even less and less other stuff.
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