Same here, I believe the only reason for Olympus to put the aperture
ring at the back is technical issue.
C.H.Ling
Jim Brokaw wrote:
>
> Most of the zooms and some of the telephoto lenses have the aperture ring at
> the camera end due to the additional mechanical mechanisms inside which make
> it harder to control the aperture from the front. I think the 90/2.0 has a
> double-helical focus mechanism, which might also have made Olympus decide to
> put the aperture ring at the camera end... probably simpler to keep it
> linked up without complicated interleaving pins and slotted arms, etc.
> Actually that's what are inside most of the lenses, to accomodate the
> movement of the focus mount, but more movements are involved with zooms
> hence the apertures at the back end.
> --
>
> Jim Brokaw
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