D80 metering comparision DX vs Sigma

Started Apr 12, 2007 | Discussions thread
dumbo Veteran Member • Posts: 3,965
Re: D80 metering comparision DX vs Sigma

Or is this because the real speed of the lense is not
fully described by "F-value" but "T-value"??

The F-value reported by the lens is not always the exact effective aperture. I saw a comparison done regarding that quite a while ago, and even if the expsosure didn't vary the DOF did, with the same selected aperture on two different lenses.
Transmission shoudl be taken care of by the metering though.

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