The change in the amount of light coming in is what is being meter, it's nto
doing math sctrictly based on what the aperature is set at.
At 04:55 PM 3/6/01 +0100, you wrote:
>Hi,
>
>how does a manual camera like an MX know what the correct exposure time is
>with
>for example a macro lens. As the magnification increases the eff. f-stop
>increases
>so exposure should be longer right? But the MX doesn't know the current
>magnification so how does it do correct exposure time. Only thing I can
>think of
>is that a macro lens doesn't have an automatic aperture.
>
>Frank
>
>-
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