Yes, you are right, the new and old version are different. The new version has
constant aperture when you set from F5.6 and below. It is much more convenient
than
the old version, but also created one problem, the finder is always at F4.5
when you
have stopped down the lens. So at 35mm the finder is not as bright as the old
version.
C.H.Ling
> ----- Original Message -----
> From: "C.H.Ling" <chling@xxxxxxxxxxxx>
> > Just tested the newer 35-105 setting at F8, point to a plain wall. My
> > OM-1n, 2n
and 4
> > all read 1/2s (with the 2n read very little below 1/2s, I think it was less
> > than
1/3
> > stop). There is no different between 35 to 105mm on my OM4.
>
> The actual difference from f3.5 to f4.5 is log(4.5/3.5)/log(1.4142) = 0.73 f
> stops.
> You should be getting 3/4 stop difference (unless new model lens is different,
> mine is the flat rear element model).
>
> - Parzival
>
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