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PostPosted: Mon Jun 23, 2008 3:21 am 
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Joined: Mon Jun 23, 2008 2:48 am
Posts: 15
Hey guys/gals! I've got a new Xsi, and I have a question regarding the automatic exposure compensation.

I took two pictures of the same stationary object, in the same lighting. In "P" mode, the camera set my shutter to 1/60 and the apeture to f/4. I immeadiately took the second pic in "Av" mode and set a matching apeture of f/4. But this time the camera set the shutter to 0.3 seconds. All other settings remained the same: ISO, Metering Mode, WB, etc.

With the exposure level the same, shouldn't the shutter speeds be identical in both situations? What am I missing?

Please be gentle. :D

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Canon XSi/450D, Canon EF-S 18-55 IS, Nifty Fifty, 24-105L, 70-200mm f/2.8 IS USM, 430EX II Speedlite


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PostPosted: Mon Jun 23, 2008 5:11 am 
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Joined: Sat Jun 21, 2008 12:49 am
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Hi,
I am also a beginner. I suppose that, maybe the computer's calculation get a different result when you did it with Av.

I just got my XSi too. We are in the same boat:D

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PostPosted: Sun Jul 06, 2008 3:45 am 
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Well, tried to do some research, but I still can't find an explanation.

I've experimented with different situations, but the exposure settings are always different. It's crazy! :?

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PostPosted: Sun Jul 06, 2008 4:08 am 
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Joined: Tue Jun 10, 2008 6:07 am
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mako1200 wrote:
Well, tried to do some research, but I still can't find an explanation.

I've experimented with different situations, but the exposure settings are always different. It's crazy! :?


Perhaps the metering mode was different in P mode than it was in A mode.

By metering a different section of the frame, the camera will change it's exposure.

Best,
-Sean.

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PostPosted: Sun Jul 06, 2008 8:25 am 
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Hi folks,

I've moved this thread to the Canon forum since it is a question about the XSi and it's metering. But I've left a "shadow" behind so everyone can find it. 8)

Bob.

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