You are correct. I should have said electro-mechanical. I wouldn't
expect an E thing to have a purely mechanical device. Accommodating a
mechanical aperture arm protruding into the camera is already too much
of a throw back for Mark. Adding a wind lever would be too upsetting
even for me. :-)
Chuck Norcutt
Moose wrote:
> Mark Dapoz wrote:
>> On Thu, 17 Apr 2008, Chuck Norcutt wrote:
>>
>>> Since the 4/3 mount and OM mount have basically the same diameter it would
>>> have been quite possible to include a mechanical stop-down mechanism in the
>>> design...
>>>
>> I think it's more than that. In the OM's the upward movement of the mirror
>> is what triggers the lens stop down lever. There's a large amount of
>> tension on the mirror frame in order to have enough enegy to move the levers
>> in those large OM lenses. I can't imagine the tiny E-system mirror having
>> enough oomph to push the lens lever as it moves up....
> I'm not sure about Chuck, but if I had written what he did, 'mechanical'
> would have applied to the mechanism already in the lenses, not to the
> means of activating it. The E series are electro-mechanical, and I
> assume a solenoid (Already used in OMs starting with the OM-2) or motor
> would be used on the camera end of such a design.
>
> Also, on another part of this general thread, I agree with Johann, that
> there are no significant technical barriers to creation of an OM=>4/3
> adapter with auto stop-down. Someone suggested it might require chips in
> lenses, but that's not necessary. A processor and input device, knob,
> slider, whatnot, on the adapter could handle that. In addition to
> bringing Auto diaphragm to bodies other than the E-510 & E-3, it would
> result in focal length in the EXIF and might be easier than making the
> menu selections for IS adjustment on the E-510 & E-3.
>
> The problem isn't technical, but economic. I can't imagine the market
> supporting enough volume to turn a profit on the development and tooling
> costs.
>
> Moose
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
>
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|