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Re: [OM] Long exposures with OM-4Ti

Subject: Re: [OM] Long exposures with OM-4Ti
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Sun, 06 Jun 2021 06:09:55 -0700
At 6/6/2021 01:13 AM, AG Schnozz wrote:
>I thought it was 2 minutes.
>
>AG Schnozz
>
>On Sat, Jun 5, 2021 at 9:06 PM Wayne Harridge
><wayne.harridge@xxxxxxxxxxxxxxxxxxx> wrote:
>>
>>
>> Can anyone remember what the longest auto exposure is provided by the OM-4Ti 
>> ?  I've been sorting out some of my collection of photo gear and came across 
>> a pinhole body cap so I mounted it on the OM-4Ti loaded with Agfa APX-25 
>> rated at ISO 12.  I started an exposure and timed it at 3 min, just 
>> wondering if that is the limit or correct exposure ?
>>
>>  ...Wayne

2 minutes is what I remember but wikipedia says 240 seconds. I analyzed the 
circuits a long time ago (from patents). The OM4Ti exposes by integrating the 
light reflected off the film plane, there is a limit to the performance. I 
don't recall if that was just the spec limit or if there was some leakage/bias 
current that caused the limit. I never tested it. But the feature was the main 
reason I went for OM gear. As simple as those circuits were, they were, to me, 
an analog design marvel. To do what they did with 2 SR44 batteries even. 
Multi-spot was icing on the cake.

WayneS

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