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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