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RE: [OM] OM-4 vs. OM-4T

Subject: RE: [OM] OM-4 vs. OM-4T
From: Scott Gomez <scott@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 22 Jun 2001 19:55:46 -0700
Thanks for that, John. I was wondering how it was done.

---
Scott

-----Original Message-----
From: John A. Lind [mailto:jlind@xxxxxxxxxxx]
Subject: Re: [OM] OM-4 vs. OM-4T

At 15:42 6/22/01, Scott Gomez wrote:
>3) The OM-4T(i)s can sync at any shutter speed using the F-280 flash.

It doesn't really "sync" doing this as most people would think of a flash 
sync (X-sync).  The F-280 must be in "Super FP" mode.  In doing this the 
OM-4T will "FP-sync" instead of "X-sync."  FP-sync triggers the flash just 
before the leading curtain opens.  The flash dumps its entire charge in 
very rapid series of flashes that continue until just after the trailing 
curtain closes.  Note that the Guide Number plummets as you increase 
shutter speed.  BTW, this is very close to the original FP-sync which used 
long duration flash bulbs such as the #26 (long duration version of the 
Press 25).  Same with them; Guide Number plummeted with increased shutter 
speed.

-- John

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