I agree with your reasoning regarding the mirror but I would have
expected a solenoid actuation in an electronic camera. And, regardless
of how it's implemented Nikon and Pentax were both able to do it.
Chuck Norcutt
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 exactly as Nikon and Pentax have done. I
>> suspect that they never even thought of it just as they never thought of
>> the firmware for focal length entry for anti-shake until Pentax showed
>> them how.
>
> 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 sure they
> could have made the mirror frame larger to accomodate the OM lens but that
> would have significantly increased the size of the body as well as the
> overall cost. That's something most users probably don't want.
> -mark
>
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