I have not tried this with a 2N. The 4, 4T are very different designs, though
it
night work.
ZC1792 (known as the "P" board), controls several functions in the 2N, supplies
power to the main circuit under the mirror box floor, controls the 3.5 minute
maximum
auto speed, and is ON for all exposures, as soon as the mirror goes up. A 2N
will
not work without it.
John
Camtech
Frank van Lindert wrote:
> On Wed, 21 Jan 1998 13:27:20 -0500, John Hermanson <omtech@xxxxxxxxx>
> wrote:
>
> >With the original OM-2, TTL flash exposure would stay open if the flash
> >reached
> >full output without quenching the SBCs. After enough ambient light was
> >collected, the shutter would finally close. This allowed for good ttl flash
> >if
> >you're in range, and interesting effects if out of range.
> >The small circuit in the bottom of the 2N (ZC1792) forces a 1/60th shutter
> >speed
> >in ttl flash mode no matter what the flash puts out. So at (ie) 100' with a
> >T32, lens at f11, the flash will go full dump, the shutter will be open for
> >1/60
> >and you'll have underexposure, whereas the OM-2 shutter would stay open and
> >give
> >you experimental results.
> >
> >John
> >Camtech
> >
> John,
>
> Can you confirm that the 2N (and 4,4T) would behave like the original
> OM-2 when the flash-ready signal pin on the flash shoe is taped off?
> Is this ZC1792 circuit triggered by the flash-ready signal?
>
> Frank.
>
> * Frank van Lindert|Royal Netherlands Meteorological Institute KNMI *
> * Utrecht |POB 201 = NL-3730 AE De Bilt = Netherlands *
> * The Netherlands |phone +31 30 220 64 54 = fax +31 30 221 13 71 *
> * |home: +31 30 252 22 55 = lindertv@xxxxxxx *
>
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