My 7D has gone mad! Exposures all over!

My 7D has gone mad! Exposures all over!

13 posts
25 May 2015
EmmWoodPhotography
Photographer
EmmWoodPhoto..
I am beyond confused! So, my camera's recently started doing this.. Two consecutive shots can give two very different images, which isn't great when you're working for an events company and you're having to delete half the shots! ISO was on 400 all day, shooting AV mode. It's worse for fluctuating in bright sunlight than dull days. Links to pics below and the properties of images. Settings are jumping all over the place! Not only shutter speed but fstop too!? Any ideas??

ISO 400, AV. Auto WB.
http://tinypic.com/r/2eo8zud/8
http://tinypic.com/r/kd732q/8

ISO 400. AV. Auto WB.
http://tinypic.com/r/2lyvxf/8
http://tinypic.com/r/2rdc6dz/8

Posted 25 May 2015
Edited by EmmWoodPhotography 25 May 2015
paulford
Photographer
paulford
Does it have an auto bracketing setting? or have you been doing some sort of HDR stuff?

Posted 26 May 2015
RedChecker
Photographer
RedChecker
Firstly AV mode is semi-automatic and will change the exposure constantly depending on what the camera is looking at each time it takes a meter reading.

Secondly, Auto WB will also change contstantly depending on what it's looking at as well and will give you random 'warm' and 'cold' shots.

Put the thing on 'M' and set the WB to the sun symbol (or 5500) for outdoor use and go from there.  Learn to use histograms for manual exposure and your life will be so much easier.  As long as WB is constant throughout a shoot, you can always batch-tweak it in your editing software afterwards.
Posted 26 May 2015
Edited by RedChecker 26 May 2015
mph
Photographer
mph
RedChecker
Firstly AV mode is semi-automatic and will change the exposure constantly depending on what the camera is looking at each time it takes a meter reading. Secondly, Auto WB will also change contstantly depending on what it's looking at as well and will give you random 'warm' and 'cold' shots. Put the thing on 'M' and set the WB to the sun symbol (or 5500) for outdoor use and go from there.  Learn to use histograms for manual exposure and your life will be so much easier.  As long as WB is constant throughout a shoot, you can always batch-tweak it in your editing software afterwards.
But set on AV and she says the aperture is changing too?
Posted 26 May 2015
RedChecker
Photographer
RedChecker
Is 'Safty Shift' turned on? (as this will force an aperture change iirc to ensure a correct exposure)

Was flash being used? (as this can also override some settings).

Regardless, I'd still say using any auto/semi-auto mode is asking for trouble, and removes variables for troubleshooting.

Posted 26 May 2015
Edited by RedChecker 26 May 2015
profilepictures
Photographer
profilepictu..
I'd get the camera checked out, shooting events regularly with AV and AWB set, I just don't experience great problems with countless changes in lighting set ups. I just shoot RAW and set to auto to batch process. Very occasionally there might be a colour cast from a reflecting surface that needs to be addressed to taste, but the balance is accurate.

Posted 26 May 2015
RedChecker
Photographer
RedChecker
It could also be the metering mode used. If you're using spot and not pre-registering a mid-tone (say) then it'll be all over the place as you're shooting. Evaluative is probably best for point & shoot without worrying about registering a mid-tone or highlight.

Posted 26 May 2015
riddell
Photographer
riddell

You've had some great advice so far. Its probably user error, but the best way to test would be -

Put the camera on a tripod and shoot in a room with no direct sunlight, don't move the camera. Just run off several frames.

If the photos go in a sequence, correctly exposed, under, over, correct, under, over, correct, under, over (or similar) then its auto bracketing that's on and causing your problem.

If the images are consistent then the camera is probably ok. Otherwise it may have a fault.

Repeat outside. Hopefully its all OK now.

Then making sure that bracketing is not on, shoot a dark area then a bright area. Again the camera should be able to cope, as long as you don't move the camera and keep shooting several frames into that dark and then into that light area, it should be consistent even if its wrong.

If it is consistent, but wrong then it may indicate the wrong metering mode.

If you still have problems then the final test would be to shoot those dark and light areas in manual mode, it doesn't matter if you get the exposure wrong. We just have to ensure each image is consistent.

If its still doing it in manual mode and auto bracketing definitely isn't on then in most certainly faulty.

If its fine in manual, but not in AV, then its possible you have a problem, but its still possible that there are user errors, I'd need a lot more detail at this point to assist you further.

Paul.
www.photographybyriddell.co.uk



Posted 26 May 2015
nikondave
Photographer
nikondave
Id say its auto bracketing, and maybe see if you've caught the spot metering !

Posted 27 May 2015
paulford
Photographer
paulford
Try shooting the same subject from same place, Something that is pretty immobile, car on drive or parked on road, Just point camera at it and rattle about a dozen or so shots off at same time, if its any sort of auto bracketing, the pictures should vary from under exposed to some thing like correct then to over exposed, In fairy equal stops/stages. Another thing is swap lenses if possible and try the same thing, not very likely but aperture might be sticking, or not operating correctly, Try GENTLY! cleaning contacts on body and lens, (soft cotton cloth)being careful not to touch mirror.


Posted 27 May 2015
paulford
Photographer
paulford
paulford
Try shooting the same subject from same place, Something that is pretty immobile, car on drive or parked on road, Just point camera at it and rattle about a dozen or so shots off at same time, if its any sort of auto bracketing, the pictures should vary from under exposed to some thing like correct then to over exposed, In fairy equal stops/stages. Another thing is swap lenses if possible and try the same thing, not very likely but aperture might be sticking, or not operating correctly, Try GENTLY! cleaning contacts on body and lens, (soft cotton cloth)being careful not to touch mirror.
Just read through and noticed Riddell gave almost the same actions, just ignore me
Posted 27 May 2015
Claypaws
Photographer
Claypaws
I think RedChecker has pretty much said it. Looking at your images of exif data, I see that the metering mode used was Centre Weighted Average. This will virtually guarantee the wrong exposure as it uses a central blob that is not much bigger than the spot of spot metering. Your subject has a dark background in the trees, a light grass foreground and players of varying brightness and garb. Whatever happens to lie in the centre spot will heavily influence the exposure.

As RedChecker says, I would also use manual rather than AV and I would do so with evaluative metering and check the histogram. Personally, I prefer WB to be set to cloudy rather than sunny for outdoor use, even when the weather is sunny. Avoid auto WB like the plague that it is. At least if you have a fixed WB, it is easier to alter a batch of images.

I would not jump to getting the camera checked or cleaning contacts.

Posted 27 May 2015
EmmWoodPhotography
Photographer
EmmWoodPhoto..
To the idiot that thought it would be funny to send a childish email using mixmaster, grow the hell up! I know said person is on here because this is the ONLY place I've asked this question!

To everyone else, thanks for your help. I ended up resetting the body to default and cleaning the contacts and one of the two have fixed the issue. We discovered the issue began after another events company changed my settings to 5700 colour temp, and then I changed them back to auto. Whatever was wrong, it's working fine now

#0000ff">MODERATOR EDIT
Emma
Anyone could have sent you that
PureStorm is an open forum in which anyone can access and read threads
other than premuim sections
So this does not mean the silly person that did this must be a member on here
Posted 28 May 2015
Edited by Chosin 28 May 2015
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