For the slit to stay open all the way across (and at 1/1000, slit may only
be a few mm), the two curtains must travel at nearly the same speed as they
go across the film aperture. If the 2nd is too fast or the 1st too slow, the
slit will close, causing no exposure or a dark area on your film.
----------------------------------------------------
John Hermanson www.zuiko.com
mail: omtech@xxxxxxxxx
Camtech Photo Services, Inc.
21 South Lane, Huntington NY 11743-4714
631-424-2121
------------------------------------------------
----- Original Message -----
From: "Yefei He" <yhe@xxxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Tuesday, June 15, 2004 12:50 PM
Subject: [OM] Re: Strange problem with OM-4 Ti - dark left border on some
>
> Hi, Bernard,
>
> I own multiple brands of cameras and this seems to be a common
> problem among cameras that have been used (or not been used) for a
> long time. At higher shutter speeds, the shutter curtain is not
> fully open. You can take the lens off the camera, open the back,
> aim the camera at a bright light source, fire the shutter at higher
> speeds, and see how the horizontally travelling shutter curtain does
> not get fully open on the right side before it is closed again. If the
> camera has a vertical travelling copal square type shutter, then the
> curtain does not get fully open on the top and you'll see darkened
> top in the prints. I have a Nikkormat FT3 that has darkened top problem
> at high speeds, and a Rolleiflex SL35 and an Olympus FTL that have
> darkened left side problem. I'm no camera repair technician but I
> figure a CLA will most likely solve the problem. I can't confirm this
> though, because I haven't sent my aforementioned cameras for CLA's yet.
>
> Cheers,
>
> Yefei
>
> >
> > Date: Tue, 15 Jun 2004 00:09:57 +0200
> > From: Bernard Frangoulis <lists@xxxxxxxxx>
> > Subject: [OM] Re: Strange problem with OM-4 Ti - dark left
> > border on some
> >
> > >Interesting... The left edge of the second curtain bar is
> > about 5 mm to
> > >the left of the left edge of first curtain bar, must be
> > slipped. Which
> > >end of the camera do I tap firmly against the desk to 'nudge' it back
> > >into place?? :-P
> >
> > As I said, in my case the left edge of the second curtain bar is less
> > than 1 mm to the left of the left edge of the first curtain bar.
> >
> > >
> > >I've posted some examples of the problem here
> > ><http://moosemystic.net/Gallery/Shutter/index.htm>. Both the top 3
> > >images and the bottom 2 show the result of increasing shutter speed.
> > >Perhaps Bernard can describe his symptoms by describing how
> > they are the
> > >same or different from mine.
> >
> > I have never encountered cases as extreme than in your rightmost
> > images. The worst I got was similar to your middle top and bottom
> > left images.
> >
> > Bernard (going to bed now ;-)
> >
> >
> >
>
>
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