As I recall, maybe in the FAQ, that photo diode sensitivity is the reason.
They keep integrating photons, and even with the lens cap on photons stray
in. Any physicists out there? I've been doing software so long that my
physics has all but fizzled.
>The OM-2N manual "guarantees" low light exposure to 2 minutes but in
>practice it is almost ALWAYS 3.5 minutes.
>
>John
>Camtech
>http://www.zuiko.com
>
>Frank Ernens wrote:
>>
>> Wayne Harridge wrote:
>>
>> > > Much as I hate to admit it, go the OM-2 or 2n. It is unsurpassed for
>>long
>> > > time exposure in auto
>> > >
>> > I saw somewhere (the FAQ maybe) that the maximum exposure time for
>> > the OM-2N is 2 minutes, however I tested my OM-2N and found that the
>>shutter
>> > consistently closed after 3 min 48 sec with a body cap attached. Is this
>> > normal or is my OM-2N faulty.
>>
>> I don't think so. My OM2N also goes past 2 minutes, but exposures made
>> with it look correct down to 10-20s (as long as I have tried).
>> You can end the exposure by moving the switch from AUTO to OFF.
>>
>> The 2 minutes may well be regulated by a capacitor, being before
>> the days of embedded CPUs, and some types of caps alter their
>> values with age. I imagine it is unrelated to the circuitry which
>> does the short timing.
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