There is a simple answer, Olympus take care of the light fall off when
lenses are wide open. In average you won't get one stop different from
wide open to next stop of it.
C.H.Ling
wayneharridge@xxxxxxxxxxxxxxx wrote:
>
> Frieder wrote:
>
> > This is a strange effect, but it is exact what the meter does.
> > >From F1.4 -> F1.2 the exposure indicator of my OM 2sp moves 1~1.5 Index
> > >fields
> > ( 1/3~1/2-F-stop) instead of 3 for a hole F-stop.
> > This is caused due to the lever which is telling the camera how much the
> > lens
> > is stopped down. The marks between F 1.4 and F 2.0 are nearer together than
> > the
> > others which causes this difference. So it seems it is what the lens does.
> > This phenomen is visible on every Zuiko I have. The first F-stop is not a
> > whole F-stop ( at least one index missing). It is hard to guess why this is
> > so and weather it affects the real speed of the lens?
> > Seems exposure with internal meter should always be correct,
> > but when working with a hand-held-meter?
>
> That's interesting !
>
> Also note that I measured exposure time with a stop watch (admitted, not that
> accurate) from the auto OTF measurement made by the body. I should really
> check this with some other lenses.
>
> ...Wayne
>
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