Exposure compensation, a stupid question.

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markyd

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This is probably a daft question, but here goes;

I noticed the following whilst trying to takes photos of the moon last week. I took the first ones with my D90 and 70-300VR. Set to P mode and spot metering. Photo was fine with no exposure compensation. Changed to my f2.8 150 sigma (macro) and had to go to -2.3 on exposure compensation to stop it over exposing. Camera was on tripod and the metering was on the moon both times.

Is there something wrong with the lens? I haven't used it much, but hadn't noticed it doing anything odd before.
 
I would imagine that with the shorter focal length the spot metering wasn't as accurate (moon not filling the spot) and so the camera was over exposing the moon hence your need to dial in -ve EC. You don't need to be on P to shoot the moon, if full, F11 & 1/125 or 1/250 or thereabouts have always served me (and others) well.
 
f2.5 would allow a lot of light in. And the moon is a bright subject. I would say to much glass for the subject. So that is more than likely why you had to make ajustments.
 
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