-= 1D MkIII Owners discuss =- and Post Your Pics

little egret coming in to land .

IMAGE LINK: https://flic.kr/p/nxxJ​1W

waterrockets wrote in post #16945328
Great set rawshorty

the black fox wrote in post #16945785
great shots rawshorty .

.

Thank you both very much, gotta love the 1Diii

waterrockets wrote in post #16945328
When you do the same settings, do them in "M," not AV, with manual ISO. You need to eliminate the possibility of exposure compensation causing this.

Great set rawshorty

I've tried this morning an image in AV at ISO 500, f/8 which gave a shutter of 1/40, turned out over exposed and the same settings in manual gave the same results.

IMAGE LINK: https://flic.kr/p/nxFj​TN

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chrismid259 wrote in post #16946018
I've tried this morning an image in AV at ISO 500, f/8 which gave a shutter of 1/40, turned out over exposed and the same settings in manual gave the same results.
Flickr

Unfortunately, this isn't helping. Please set your mode to M, set ISO to 100, set aperture to something neutral, like f/8, set shutter speed until you're centered on the exposure meter, release shutter, and let us see the result. If the resulting image is overexposed, it might be a good exercise to try this also with your aperture at f/4 and at f/16 or so (adjusting shutter speed to compensate back to a zeroed meter), just to see if there's something wrong with lens aperture communication.

waterrockets wrote in post #16946098
Unfortunately, this isn't helping. Please set your mode to M, set ISO to 100, set aperture to something neutral, like f/8, set shutter speed until you're centered on the exposure meter, release shutter, and let us see the result. If the resulting image is overexposed, it might be a good exercise to try this also with your aperture at f/4 and at f/16 or so (adjusting shutter speed to compensate back to a zeroed meter), just to see if there's something wrong with lens aperture communication.

My apologies. I've done as said. Results are below.

Manual, ISO 100, f/4, 1/30

IMAGE LINK: https://flic.kr/p/nxHB​Ju

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IMAGE LINK: https://flic.kr/p/nQ9t​rW

chrismid259 wrote in post #16946117
My apologies. I've done as said. Results are below.

Much more useful. I would say that it looks like the lens is not changing its aperture. Can you set it to f/22 or something really high, then hold the depth of field preview button? While holding it, look into the lens from the front and see if you can tell that the blades have masked off a bunch of aperture. There should be a big black disc with a small hole in the middle, and when you release the preview button, the hole should get enormous instantly.

Try it on your working lens as well.

Here's the button: http://www.borrowlense​s.com …s/2012/08/1divb​uttons.jpg

I'm also wondering if it works fine when the aperture is wide open.

waterrockets wrote in post #16946228
Much more useful. I would say that it looks like the lens is not changing its aperture. Can you set it to f/22 or something really high, then hold the depth of field preview button? While holding it, look into the lens from the front and see if you can tell that the blades have masked off a bunch of aperture. There should be a big black disc with a small hole in the middle, and when you release the preview button, the hole should get enormous instantly.

Try it on your working lens as well.

Here's the button: http://www.borrowlense​s.com …s/2012/08/1divb​uttons.jpg

I'm also wondering if it works fine when the aperture is wide open.

Thanks for your reply. I've set the aperture to f/22, hit the DOF preview button, the tiny hole appears, then when released gets enormous straight away. All lenses do the same. I've just shot a few images with the working lens I said about in one of my earlier posts to and this also appears to be overexposing images too - although, every so often it will get the correct exposure.

Maybe this is a problem with one of the contacts in the camera, rather than the lenses?

Hmm. My usefulness here is starting to pass...

Can you shoot your 6d in M mode, and set the same ISO, aperture, and shutter speed? It would be good to do with the 1D at the same time in case of lighting changes since your earlier shots.

If the 6D is over exposed, then your 1D light meter might be messed up. The inverse of this test then is to shoot a manually and properly exposed image on the 6D and try the same settings on the 1D.

waterrockets wrote in post #16946325
Hmm. My usefulness here is starting to pass...

Can you shoot your 6d in M mode, and set the same ISO, aperture, and shutter speed? It would be good to do with the 1D at the same time in case of lighting changes since your earlier shots.

If the 6D is over exposed, then your 1D light meter might be messed up. The inverse of this test then is to shoot a manually and properly exposed image on the 6D and try the same settings on the 1D.

Using the same test as before, using manual and moving the shutter speed to 0, I get these results.

6D, Manual, 100, 1/60, f/8

IMAGE LINK: https://flic.kr/p/nNfL​WC

IMAGE LINK: https://flic.kr/p/nS5H​gV

IMAGE LINK: https://flic.kr/p/nS5H​bV

Well, now I think it looks like your meter is failing somehow. I don't see any threads on the subject just yet.

Can you try shooting the 1D in AV with your exposure compensation at -3 (all the way to the left)? With this info, I think you have enough evidence to throw a thread up in the parent to this thread, just to see if anyone on POTN has seen something like this.

waterrockets wrote in post #16946228
.... I would say that it looks like the lens is not changing its aperture.....

This was my first thought as well.

Crap, that makes this more confusing to be sure.

I think you are on to something with the possibility of a bad contact between the body and this lens in particular. The timing of the aperture stopping down seems to be off.

Were I you, my first order of business would be to take the camera out with a handful of lenses, not the 50mm, and shoot a lot. Like, really a lot! just make sure that during a lot of shooting, that it's only happening with the one lens.

from there you at least can be comfortable the issue is isolated.

Or, just go ahead and hand both body and lens to Canon ...

Ok, my verdict now rests on light meter issue of some sort.

The -3 stop amount (the difference between 1/60 and 1/8) has me wondering if this might be from a setting or something, because -3, and the exposure is nailed perfect (at least for two of the above shots).

Before calling Canon, I'd write out all of your settings and C.Fn to the memory card, then do a complete settings reset. Then see if it still is doing this.

If so, then...

CyberDyneSystems wrote in post #16946428
Or, just go ahead and hand both body and lens to Canon ...

waterrockets wrote in post #16946482
Ok, my verdict now rests on light meter issue of some sort.

The -3 stop amount (the difference between 1/60 and 1/8) has me wondering if this might be from a setting or something, because -3, and the exposure is nailed perfect (at least for two of the above shots).

Before calling Canon, I'd write out all of your settings and C.Fn to the memory card, then do a complete settings reset. Then see if it still is doing this.

If so, then...

I've reset the camera settings and custom settings a number of times since I recieved it. This hasn't made any difference, unfortunatly.

That stinks. I'm not sure what else to suggest. At least you have a workaround (-3 EC) until you either find another poster who can dig deeper, or get it to Canon. I just looked through the manual to see if there was some sort of setting that could set a baseline EC or something, and found nothing.

Please post back whatever you learn.