Omer Nezih Gerek wrote:
>
> >
> > Omer Nezih Gerek wrote:
> >
> > > How does the OTF trigger faster than 1/60? Or does it? Only at 1/60 or
> > > slower, the shutter is completely open, and if the sensor detects over
> > > exposure (integral of the ligh, depending on ASA) immediately, it should
> > > start closing the shutter. Is there a faster reaction system in OM's?
> > > Does it, for example, trace the shutter horizontally, as well? The stripe
> > > that traces the shutter plane during 1/1000 is quite narrow. Is it
> > > possible for the sensor to react so instantly that the second curtain
> > > starts following the first opening immediately to produce 1/1000th?
> > >
> > Easy, it measures the ligth before it opens the shutter. If the results
> > indicate a shutter time faster then 1/60 the shutter opens at that speed
> > and will not change. For slower speeds the camera makes a OTF exposure.
> >
> > Richard
> >
>
> Obviously the metering prior to shutter means something. However,
> in the OFF position of OM2N, the camera does not make a prior
> metering. If it solely depends on the OTF metering during exposure,
> it should not give exposures faster than 1/60. The subject was
> about the OFF position of OM2N, I guess. The responses indicated
> that the OFF mode does not shoot slower than 1/30, I guess it does
> not shoot faster than 1/60 either. This makes a very restricted
> shutter range (1/30 and 1/60 only).
The CDS-meter in the finder does nothing for the exposure in AUTO mode,
it´s just an indicator for the expected shutter time.
The meter for AUTO is switched on automaticly with the mirror moving up.
It´s a SBC and looks in direction to the film plane, first on the
patterned shutter curtain and for exposures longer 1/60 on the film.
The length of the longest exposure time is determined by the ASA dial.
As lower the ASA number as longer the maximum exposure (true for all
automatic OM-bodys).
This is true too for the AUTO OFF mode, all speeds in the manual are
given for ASA 100.
When you use ASA 25 film, you will get longer AUTO OFF mode exposures.
Richard
##################################################################
# This message was delivered via the Olympus Mailing List
# To receive the Olympus Digest send mail to: listserv@xxxxxxxxxxxxxxx
# with subscribe olympus-digest in the message body.
#
# To unsubscribe from the current list send a message to
# listserv@xxxxxxxxxxxxxxx with unsubscribe olympus in the message body.
#
# For questions email: owner-olympus@xxxxxxxxxxxxxxx
##################################################################
|