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Re: [OM] Hep! Dr. Flash needs... um, flash help

Subject: Re: [OM] Hep! Dr. Flash needs... um, flash help
From: USHER99@xxxxxxx
Date: Sat, 27 Dec 2008 16:03:52 EST

So what happens with an OM-2 with a similar scenario?  Would the flash  in 
normal auto trip the shutter faster than the synch speed resulting in an  
A. Curious Mike
OK, I think I have this figured out.  I finally found the reference to 

the fixed 1/60 second shutter speed with a T-flash attached.  It's in 

the eSIF.  It does not appear in the OM-2/2n or T-32 manuals. 

Furthermore, it's specific to the OM-2n.  The OM-2 does not do flash 

ready, does not know the flash is there and doesn't force the shutter 

speed to any specific value.

Yes, the camera does show "flash ready" with both body and flash in 

their respective auto modes.  That should mean that the camera has 

recognized a T-flash unit and, since the ambient light was well below 

1/60 second, it has set the shutter to 1/60.  Since the camera is in 

auto mode and has sensed a T-flash it will assume that the T-flash is in 

TTL mode... it has no way of knowing that it's not.  When the flash 

fires, the camera will issue a quench signal to the flash when 

sufficient light has been received.  However, since the flash is in auto 

and not TTL mode the flash isn't paying attention to the quench signal. 

  It will do its own thing according to the indicated ISO and aperture 

on the calculator panel which was showing ISO 400 and f/8.  Those 

exposures taken at f/8 should be properly exposed.  Those exposures 

taken after the aperture ring was accidentally shifted to f/11 will be 

underexposed by one stop.  As Wayne indicated that's not much of an 

error for color negative film.

Dr. Flash

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