peter,
when imanual mode you need to use the large control dial on the back
to change the shutter speed but you need to check the wheel is
activated via the main power switch. In av mode the camera picks the
shutter speed according to the apeture selected.

regards

mark

On 12/30/07, Peter B. <bennito42@...> wrote:
> I have owned a Canon 5D Body for approximately 9 months and am
> finding (intermittently) that once an aperture is set in either Manual
> Mode or Shutter Peiority mode I cannot change it until I shut the
> camera down and clear all "Function Settings" and other Settings and
> turn the Canon5D back on.
>
> Is it that I'm not knowing how to set things up properly or should it
> go back to Canon under warranty ?
>
> Regards,
>
> Peter.
>
>

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