TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] Questions on OM-2n

Subject: Re: [OM] Questions on OM-2n
From: Ken Norton <kenorton@xxxxxxxxxx>
Date: Thu, 15 Jan 1998 08:58:53 -0600
>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?


The shutter curtain has a reflective pattern on it that simulates the
surface of the film. This allows the OTF metering to create exposures
faster than 1/60.  Brilliant design, really.

Ken Norton

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