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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 08 Mar 2018 (Thursday) 12:26
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6D Suddenly Underexposes shots

 
trajectory ­ fish
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Mar 08, 2018 12:26 |  #1

Hi! I've been using a 6d for a few years now, and just in the last month, it has started to underexpose most of my outdoor shots. For some reason, indoors is fine, but brighter places look way too dark (but not useless), which adds to my post-processing time. I have tried all of the metering modes with no luck, as well as different priority modes.

I have seen recommendations on other forums about doing a factory-reset.

Has anyone else experienced this?

Thanks!
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Mar 08, 2018 12:36 |  #2

I know this question is the equivalent of a mechanic asking "Does it have gas in it." But, usually when that happens to me it is because I have set the exposure compensation for a difficult shot and forgot that I had set it there.

Just asking, is that setting where it should be?


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trajectory ­ fish
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Mar 08, 2018 12:49 as a reply to  @ Nogo's post |  #3

yep


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normware
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Mar 08, 2018 13:02 |  #4

1) does it do this for all your lenses?

2) always factory reset


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Nethawked
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Mar 08, 2018 14:51 |  #5

1/1000 & f/20 @ ISO800? Is this how it was metered?




  
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John ­ from ­ PA
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Mar 08, 2018 17:18 |  #6

To me the interior shot looks reasonably well exposed, perhaps needs a +1 stop to brighten it up a bit. On the the exterior shot, I can't help thinking the camera was fooled by the sky. I see a distinct shadow so using the sunny 16 rule as a basis the exposure should have been around 1/800 at f/16. The shutter speed is shorter and the f/stop of f/20 is smaller, both factors possibly contributing to the under exposure.

You do mention however that this has been going on for a month so perhaps review some past shots with a critical eye.




  
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Post edited 3 months ago by Wilt. (2 edits in all)
     
Mar 08, 2018 18:20 |  #7

Nethawked wrote in post #18580541 (external link)
1/1000 & f/20 @ ISO800? Is this how it was metered?

EXIF says Center-Weighted metering, no Exposure Compensation cranked in.

Sunny 16 rule of thumb would indication ISO 800 would need 1/800 and f/16.
1/1000 is -0.33EV, and f/20 is -0.66EV, so meter is suggesting -1EV exposure compared to Sunny 16. The fact that the light sandstone color is probably +1EV compared to 18% tonality would result in -1EV of underexposure.

If it was possible for OP to meter and shoot a gray card and post that, we could assess the resulting eyedropper sample to see how the camera is exposing that, as a controlled test.


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Mar 08, 2018 21:39 |  #8

Maybe the lens aperture is malfunctioning at small f-stops.


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Tom ­ Reichner
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Mar 08, 2018 22:05 |  #9

I just got a 6D for the first time about a month ago.

Sometimes, when I first use it, it will drastically underexpose shots. . It does this for a minute or two - anywhere from 2 to 10 frames. . Then it just kinda settles down and starts exposing properly.

It will also drastically over-expose shots. . When this happens, it is the same as when it underexposes - happens when I first pick up the camera, does it for a minute or two, and stops after several frames.

So I just make sure that if I haven't used the camera for a few hours, and pick it up to use it, to rip off a few test frames just to let it get this erratic exposure stuff out of its system.


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apersson850
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Mar 09, 2018 02:54 |  #10

Does this apply also with different lenses used on the camera?


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Mar 09, 2018 03:02 as a reply to  @ Tom Reichner's post |  #11

That’s an absurd quirk. I’d return it.


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apersson850
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Mar 09, 2018 03:48 |  #12

But returning the camera if the fault is in the lens doesn't help you very much.


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John ­ from ­ PA
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Post edited 3 months ago by John from PA.
     
Mar 09, 2018 04:27 |  #13

apersson850 wrote in post #18580893 (external link)
But returning the camera if the fault is in the lens doesn't help you very much.

Just a hunch that Frodge is likely referring to Tom's comments (quoted below), not the OP's issue.

Tom Reichner wrote in post #18580785 (external link)
I just got a 6D for the first time about a month ago.

Sometimes, when I first use it, it will drastically underexpose shots. It does this for a minute or two - anywhere from 2 to 10 frames. Then it just kinda settles down and starts exposing properly.

It will also drastically over-expose shots. When this happens, it is the same as when it underexposes - happens when I first pick up the camera, does it for a minute or two, and stops after several frames.

So I just make sure that if I haven't used the camera for a few hours, and pick it up to use it, to rip off a few test frames just to let it get this erratic exposure stuff out of its system.




  
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saea501
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Mar 09, 2018 06:53 as a reply to  @ Tom Reichner's post |  #14

That's weird.....I've never had mine do that.


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Mar 09, 2018 06:55 |  #15

It is an odd quirk that a camera has some sort of "warm up" period where it acts erratically, then later calms down and works as expected. I would love to know the programming that went into that. :)


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6D Suddenly Underexposes shots
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