Re: [OM] Ag Snozz's suggestion

Subject: Re: [OM] Ag Snozz's suggestion
From: "John A. Lind" <jlind@xxxxxxxxxxxx>
Date: Thu, 14 Feb 2002 00:20:37 +0000
At 04:20 2/14/02, Charlie Loeven wrote:
I lost the post but wanted to comment on the idea of how to do indoor flash
photography at events.
That is to get a f stop that gives you 1/15 sec. and use TTL to shut off the
flash at 1/60.  That would result in a 2 stop under exposure for the
I never thought of it that way and it really gives you some idea of what the
ambient light will do.  Of course a 1/30 sec ambient light reading will give
you a 1 stop underexposure for the background but the ambient light could
affect the flash
exposure a bit more as in too green (fluorescent) or too yellow (tungsten)I
think 2 stops would do just fine.


The other method which is a bit easier to use on some other camera brands is called "dragging" the shutter. With an OM-1[n], OM-3[ti], or any of the others in "Manual" mode, the shutter speed can be set to 1/30th second. The flash has to run in "Normal Auto" using its own sensor though. The 1/30th shutter speed will X-Sync and bring up ambient light by a stop more than running at the 1/60th X-Sync.

Unfortunately, dedicated flashes on the OM-2[n,S] and OM-4[T] will automagically set the shutter speed to 1/60th if the camera is in Auto [and Program on the 2S and PC]. As was mentioned in another thread, if the body is set to Manual Mode and the flash is in TTL Mode you will get a complete flash dump with every shot (no quench). If you look at a T-20 or T-32 and slide its calculator panel in with the "TTL Auto" side showing, you will see it moves the sliding flash mode switch just below the panel to what would be the full power (dump) "Manual Mode" position if the panel were showing the other side (for Normal Auto and Manual). In this regard the T-20 and T-32 are "dumb" about whether you are operating in TTL Auto or Manual. The camera body only activates the quench line if the camera body is in Auto [or Program] Mode.

-- John

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