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Re: [OM] Fill-in flash with T-series

Subject: Re: [OM] Fill-in flash with T-series
From: Frank van Lindert <lindertv@xxxxxxx>
Date: Thu, 22 Jan 1998 09:21:25 GMT
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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