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Re: [OM] OM 4 (Auto) - Shutter speeds

Subject: Re: [OM] OM 4 (Auto) - Shutter speeds
From: Mark Dapoz <md@xxxxxxxxxxxx>
Date: Thu, 13 Jun 2002 14:53:34 -0400 (EDT)
On Thu, 13 Jun 2002, Winsor Crosby wrote:

> >Exposure integration begins when the first curtain is released.  There's
> >a nice flow chart and timing diagram on pages I-47 and I-48 of the OM-4
> >service manual that explains all this.  Section I has all the gory details
> >of how exposures are arrived at in the OM-4.
> >                             -mark
> 
> Does it say what it is doing between the time that you push down the
> shutter release and when the first curtain is released?  The lag is
> not bad for an automatic camera, but not near as good as with a
> manual camera.

According to the diagram, the delay for the OM-4 is 40mS during which time
the display illuminator is turned off and the electromagnet voltages are
stabilising.  The timing diagram can be seen on page 50 of the following
pdf: http://olympus.dementia.org/Hardware/PDFs/OM-4_4of4.pdf
                                -mark


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