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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