Distance from the surface of the body mount to the film rails must be
46.05mm, + 0.01mm, -.02mm. The outside rails (where the pressure plate
rests) are 46.19mm from the lens mount +- .02mm.
You should make these measurements with the proper depth guage. If only one
lens won't focus properly, it is the lens, not the body. If mirror angle
is off, it will affect all lenses, the easiest test being at infinity.
John
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----- Original Message -----
From: Jerry Stackhouse <jstack@xxxxxxxx>
To: Olympus (E-mail) <olympus@xxxxxxxxxxxxxxx>
Sent: Saturday, June 05, 1999 9:44 AM
Subject: RE: [OM] 28mm Zuiko won't focus at infinity
> Thanks! Should the measurement be from the end of the lens or the film
> plane? I'll assume film plane is about equal to the hinge for the back
> door.
>
> From the film plane - the OM1 with a 50mm has a point of focus some where
> between 19 and 20 inches when set to the "." of the 0.5 meter setting. If
I
> remember correctly, a meter is 39.37 inches or so...
>
> The 28mm's point of focus when set a 0.3 meters is around 11.5 " but
should
> be (39.37/3=13.12).
>
> Looks like a lens issue?
>
>
> -----Original Message-----
> From: WKato@xxxxxxx [SMTP:WKato@xxxxxxx]
> Sent: Friday, June 04, 1999 11:57 PM
> To: olympus@xxxxxxxxxxxxxxx
> Subject: Re: [OM] 28mm Zuiko won't focus at infinity
>
> In a message dated 99-06-04 21:37:16 EDT, you write:
>
> > On a related matter - can the focus at the plane of the film be any
> > different that what I see in the camera? Can I see a focused image and
> the
> > film "see" a slightly different focus? How?
> >
> Sure if either the focusing screen isn't set into its frame correctly or
if
> the stop where the mirror rests isn't adjusted correctly, the focus will
be
> off. If the focus screen is resting on a bit of dirt or other object, it
> would force the screen closer to the lens and you would move the lens
> farther
> away from the plane of focus, which would in turn mean that the plane of
> focus in your photo would be closer than what you intended (or did I get
> that
> backwards??).
>
> You can check your focusing screen by placing a yardstick or other ruler
> going away from you on a table. Focus at 18 inches or 6 inches. If
another
> mark is in focus, then your screen or mirror is off.
>
> Warren
>
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