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noujwas Sep 24, 2004 2:40 PM

Hi everybody,

Is it normal that the AV changes automatically even in Manual Mode when taking outdoor pictures?

That's what happening when I take outdoor pictures with my Canon A75. I don't feel that I have any control over my AV. In most cases, the AV will change to F8.0 no matter what I chooseas ashutter speed.

If that's normal then there is no difference between manual and TV mode.

Any ideas?



JimC Sep 24, 2004 5:45 PM

Well, when I read your post, I first thought that you must be doing something wrong (or you were at focal length too long for the largest available aperture you were trying to set).

Then, I did some research.

From user reports on another site, it appears that the camera is stopping down the aperture in some conditons, even when in manual exposure mode, presumably to prevent overexposure, overriding your settings.

It was reported by a user to Canon Canada last month, who says that they have confirmed the issue,and passed on the information about it to both engineers in Canon U.S. and Canon Japan.

This user reports thatalthough they can't promise a specific release schedule for the update, a fixis now planned (he said that Canon Canada's words were that a firmware solution is now officially"in the pipe")

I have no way to confirm the accuracy of this user's reports.

noujwas Sep 24, 2004 7:24 PM

Thanks for the reply Jim.

I knew it had something to do with overexposure correction becauseit only happens when I'm taking outdoor pics on asunny day. It never happens for indoor or in low light.

I tried to call Canon today before I posted my message here, but their phone system seems to have a bug too.

Would you please post the link to that report?

Thanks again


JimC Sep 24, 2004 8:47 PM

If I find out anything more, I'll post it here.

JimC Oct 1, 2004 1:38 PM

Canon has posted new firmware to address this issue:

noujwas Oct 1, 2004 3:21 PM

Thanks a lot!

I just finished upgrading my firmware and the bug is gone! I did a couple of tests outside. AV doesn't change anymore.

Thanks again


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