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

Subject: Re: [OM] OM-4 vs. OM-4T
From: "John A. Lind" <jlind@xxxxxxxxxxx>
Date: Fri, 22 Jun 2001 14:51:24 +0000
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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