To just measure the equivalent shutter speed, why not use the simple
setup below? The only tool you need is a flash meter and you will need
one for good control of flash exposure anyway.
http://www.glink.net.hk/~olympus/shutt.htm
Mike (?) said he need 50 minutes to complete one set of test for a
camera that is also too long.
C.H.Ling
HI100@xxxxxxx wrote:
>
> Mike previously described his shutter testing.....
>
> Mike,
> with leaf shutters, usually the shutter open and close travel times
> become a significant part of the exposure at high shutter speeds. This means
> exactly where you set the light threshold of the detector circuit affects the
> measured speeds. Some testers integrate the recieved light signal to get
> actual light at the film plane which then takes into account travel time.
> If you test your shutter with a simple tester you may find that the
> shutter speed measured depends on aperture. This can be for light threshold
> reasons (as above) or depending on construction because a small aperture is
> obscured over a different part of leaf shutter travel. The later depends on
> how close to the leaf shutter the aperture blades are. In some auto cameras
> the shutter and aperture blades are one and the same.
>
> Regards,
> Tim Hughes
> >>Hi100@xxxxxxx<<
>
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|