Think of the OM-2 limiter as a function of the ASA setting. The LED is
dimmest for ASA 12, brightest for ASA 1600. Also, most 2Ns I've tested
will do low light exposures to 3.5 minutes. Just my opinion.
John Hermanson
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----- Original Message -----
From: <HI100@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, April 03, 2000 11:11 PM
Subject: Re: [OM] questions about other low ev cameras
> rtomcala@xxxxxxxxxxx writes:
>
> << With the release of
> the OM2n, they added a small led in the viewfinder that added to the
> exposure and limited the long exposures to about 2 minutes. This is
> why, although I love my Om2n, I keep my OM2 also. The OM2 may be hard
> on the batteries during long exposures, but it gets the shot !
> >>
> Rand,
> Both the OM2 and 2N have led limiters. Their operation actually
> causes exposure errors for very long exposures in both cameras but the
errors
> only start after 2min in the 2N. And the maximum time does not go to a lot
> longer than 2min. The 2N exposure cycle only differs from the 2 in that an
> analog timer delays the on-set of when the led is switched on and also the
> led is brighter causing the limiter to act quickly once switched on. The
> brighter LED is also more reproduceable over temperature etc so the
limiting
> action time has a much tighter tolerance and does not contribute errors
below
> the 2min timer limit. On the other hand the OM2 led limiter forces the
camera
> to act as if there is a fixed very low light in the scene over most of the
> exposure cycle instead switching in only after 2min. Since exposures are
log
> light intensity related the OM2 errors introduced only become very
> significant when the led level and the scene light level are getting to be
> similar in magnitude. The OM2 more gradual limiting action does allow for
> significantly longer exposure times but the limiter does eventually add
> significant errors although by that time film reciprocity is probably a
much
> bigger problem.
>
> >> Tim Hughes <<
> >> Hi100@xxxxxxx
>
>
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