Recently I have noticed on my 5Dc a faint shadow appearing on the right upper 1/4 portion of the frame. It's in some frames, and not in others. Before I send it into Canon, has anyone experience this or know what it could be ? It looks almost how a frame would look if a cloud were to shade out some of the sun in a frame. Weird.

A picture would be helpful.

Operating with no info, my first guess would be an improperly mounted lens hood.

No, not the lens hood because on a series of three vertical frames, two have the shadow and one doesn't.

Has the mirror fix been done?

Camera strap vignette? Been there a few times...

misty23 wrote: Recently I have noticed on my 5Dc a faint shadow appearing on the right upper 1/4 portion of the frame

Any reason not to post a picture or two? Especially after you were asked in the first sentence of the first response to do so and you made a reply that ignored the request?

It could be a camera strap as suggested or shutter failure, but ... post a picture (with EXIF info intact).

It could be shutter failure. Post a few images and check to see if it occurs at higher shutter speeds. I would hesitate to use the camera until you figure out if it is a shutter failure.

Thanks Jerry, im thinking the same thing. I had the shutter replaced last year by Canon and probably only have less than 10,000 expos on it. Unfortunately the 6 month warranty time has run out..

A sample? Please?

(There are a number of possibilities, but quite a few of them could quickly be eliminated by seeing an example. Let us know if you aren't certain how to post a sample and someone here will help you figure it out.)

Dan

Like others have said, a picture would help a lot.
AFAIK, shutter failure usually manifests itself has a brighter area, not darker.
It is caused by the shutter failing to close in time, hence the brighter area (more light hits the sensor) and why it's more prevalent at higher shutter speeds.