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[OM] Re: Strange problem with OM-4 Ti - dark left border on some photos

Subject: [OM] Re: Strange problem with OM-4 Ti - dark left border on some photos
From: "PhotoSphere Olympus Camera Service" <olyfix@xxxxxxxxxx>
Date: Mon, 14 Jun 2004 11:46:23 -0500
Also might be curtain timing has slipped -- more common on the 2s, but not
unheard of on a 4/4t.  This will only show up at higher speeds.

Easy, quick way to check -- and note that this works on every OM with cloth
curtains:
Without film (;^), open the back cover.  Wind the camera so that the black
metal curtain bar is in the center of the focal aperture (rectangle where
the picture is made).  Gently and carefully drag a fingernail from the
_left_ edge of the black metal bar across the curtain material to the
left -- this is the first curtain.  You should be able to feel the metal bar
of the second curtain just behind the material of the first curtain.
_In_most_instances_* you should be able to determine that the leading (left)
edge of the second curtain bar is 2-3mm, or no more than about 1 bar width,
to the left of the left edge of the first curtain's bar.  If the left edge
of the "hidden" bar is significantly more than 1 bar width over, chances are
that the second curtain has slipped a gear tooth or two.  Sometimes it is
possible to compensate by adjusting travel time then exposure time, but
rarely within optimal tolerance.

(* -- on rare occasions excessive overlap is necessary, and the camera has
been deliberately set this way for accuracy.  Unless you've seen a problem
with side-to-side exposure variance (dark edge) at high speeds, don't worry
about it!)

> In some pictures, the left side (or the bottom side for vertical
> shots) is dark. This affects about 10-15 % of the picture field. The
> limit between the dark and the unaffected part is gradual, blurred
> (as in a graduated filter).



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