Canon 1d III dark on left at certain apertures

Started 4 months ago | Discussions thread
Ray UK Contributing Member • Posts: 823
Re: Canon 1d III dark on left at certain apertures

erikstouffer wrote:

dark at apertures above like 3.2 or 3.5

What do you mean by above 3.2 or 3.5, are you talking about f4, f5.6, f8 etc. or f2, f2.8.

Normally any fault with the aperture mechanism will result in an even brightness fault across the whole frame. It does sound more like a shutter problem.

With the camera in landscape position the shutter travels from top to bottom but the image projected by the lens is upside down so gives the effect of travelling from the bottom to the top of the picture. If the picture is darker at either extreme then the shutter travel is inconsistent and faulty, this usually shows up at higher shutter speeds.

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