Early into the 4 production (well before the T) the shape of the switch
was changed to a slightly rounded version. Also, a lighter spring was
installed behind it.
John
Camtech
Bryant Wetzel wrote:
> Kennedy,
> As I look at the switch in my OM-4 I see that the top is rounded not
> cone shaped. Do you suppose that the factory had a change on the
> switch shape as well?
>
> Bryant
>
> ----------
> > From: Kennedy <rkm@xxxxxxxxxxxxxxxxxx>
> > To: olympus-digest@xxxxxxxxxxxxxxx
> > Subject: Re: [OM] Subject: Vivitar 28-85
> > Date: Sunday, February 15, 1998 6:11 AM
> >
> > In article , Bryant Wetzel <ardvarrk@xxxxxxxx> writes
> > >All,
> > >
> > >Regarding the switch on the lens mount of the OM-4 types. Exactly
> how does
> > >it look? I have a OM-4 that has the switch and it does beep when
> you
> > >unmount the lens, but I really can not see how it might get
> sheared.
> > >
> > >Thanks,
> > >
> > >Bryant
> >
> > If a screw head passes across the switch while the lens is twisted
> on
> > the bayonet mount, the edge of the screw hole cuts the top off the
> > switch. It doesn't shear all of the switch off (which is a cone
> shape)
> > but enough to stop it working correctly.
> >
> > It was the most common cause of failures of OM-4 cameras and even
> caused
> > Olympus to enclose bright pink warning labels with every OM-4 sold.
> > --
> > Kennedy
> > Yes, Socrates himself is particularly missed;
> > A lovely little thinker, but a bugger when he's pissed.
> > Python Philosophers (replace 'nospam' with 'kennedym' when
> replying)
> >
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