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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