Frank Wajer <[EMAIL PROTECTED]> 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.
Hi Frank,
The light that comes through the lens decreases as the magnification
increases, so the meter should be able to display the right esposure.
You can check this by setting the right speed and aperture with the lens
pointed to a plain surface and the focus set to infinity. Then focus down to
the maximum magnification of the lens: you'll see the meter reading
underexposure progressively.
Gianfranco
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