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My 7D has gone mad! Exposures all over!

25 May 2015 15:16
EmmWoodPhotography
Photographer


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


Paul thomas Ford is off-lineSilver Member
25 May 2015 23:15
paulford
Photographer
paulford
Location
United Kingdom
South Yorkshire
Doncaster

Does it have an auto bracketing setting? or have you been doing some sort of HDR stuff?


Steven Jardine is off-linePlatinum Member
26 May 2015 00:32
RedChecker
Photographer
RedChecker
Location
United Kingdom
Buckinghamshire
Stoke Mandeville

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.
When you are dead, you do not know that you are dead. All of your pain is felt by others. The same thing happens when you are stupid.


Paul Hodson is off-line
26 May 2015 03:19
mph
Photographer
mph
Location
United Kingdom
Cheshire
Crewe

Quote from 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?
Amateur - happy to do TF with models with potential and enthusiasm. Website: www.mphodson.co.uk


Steven Jardine is off-linePlatinum Member
26 May 2015 03:23
RedChecker
Photographer
RedChecker
Location
United Kingdom
Buckinghamshire
Stoke Mandeville

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.

When you are dead, you do not know that you are dead. All of your pain is felt by others. The same thing happens when you are stupid.


Profile Pictures is off-line
26 May 2015 04:04
profilepictures
Photographer
profilepictures
Location
United Kingdom
Suffolk
Bury St Edmunds

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.


Steven Jardine is off-linePlatinum Member
26 May 2015 04:17
RedChecker
Photographer
RedChecker
Location
United Kingdom
Buckinghamshire
Stoke Mandeville

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.
When you are dead, you do not know that you are dead. All of your pain is felt by others. The same thing happens when you are stupid.


Paul Riddell is off-line
26 May 2015 06:24
riddell
Photographer
riddell
Location
United Kingdom
Hertfordshire
berkhamsted


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

www.photographybyriddell.co.uk


David J Severn is off-line
27 May 2015 13:37
nikondave
Photographer
nikondave
Location
United Kingdom
Derbyshire
Derby

Id say its auto bracketing, and maybe see if you've caught the spot metering !
David J Severn Keeping Life in Focus


Paul thomas Ford is off-lineSilver Member
27 May 2015 14:11
paulford
Photographer
paulford
Location
United Kingdom
South Yorkshire
Doncaster

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.



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