>From: "Roger Davies" <rdavies@xxxxxxxxxxxx>
>
>I notice that the shutter curtain on my recently acquired OM4Ti has the
>characteristic random checkerboard pattern indicative of off-the-curtain
>exposure measurement. I was under the (obviously mistaken!) impression that
>when the OM4Ti is not using spot metering, it uses off-the-film exposure
>measurement. So, can anyone tell me under what circumstances the OM4Ti
>measures light off the shutter curtain?
Whenever the shutter speed is higher than the sync speed (1/60th), you
effectively get off-the-curtain exposure (on any auto-exposure OM), because
the shutter is never completely open -- the exposure is made through a
travelling slit between the two curtains, so the exposure comes mostly off
the curtain, with some portion of it coming from the small slit of film
visible to the sensor.
: Jan Steinman <mailto:jans@xxxxxxxxxxx>
: 19280 Rydman Court, West Linn, OR 97068-1331 USA
: +1.503.635.3229
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