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RE: [OM] Flash sync & slavery (barely OM)

Subject: RE: [OM] Flash sync & slavery (barely OM)
From: "Dave@xxxxxxxxxxxxxxx" <dave@xxxxxxxxxxxxxxx>
Date: Mon, 17 Feb 2003 18:04:09 -0600
Moose,

Thanks for the input.  Unfortunately, it's neither the focus assist light
(already tried covering it up) nor the red-eye reduction flash.  I've turned
that off as well.

Any other takers?  :(

Thanks,

Dave

>-----Original Message-----
>From: owner-olympus@xxxxxxxxxxxxxxx
>[mailto:owner-olympus@xxxxxxxxxxxxxxx]On Behalf Of Moose
>Sent: Monday, February 17, 2003 5:40 PM
>To: olympus@xxxxxxxxxxxxxxx
>Subject: Re: [OM] Flash sync & slavery (barely OM)
>
>
>I suspect that pre-flash(es) for red eye reduction and/or focus assist
>are setting off the sensor and firing the studio flashes before the
>'main' flash on the camera and image capture occur. Both my APS and
>digital Can*n P&S cameras have a menu option to turn off red eye
>reduction pre-flash. If the A20 has a focus assist light, you can tell
>if is it is causing the problem by disabling the sensor, pushing down
>part way on the shutter to lock focus, reenabling the sensor and
>completeing the exposure. Alternately, simply pushing down the shutter
>release part way would activeate the focus assist light without firing
>the flash. If that sets off the studio flashes, that's the problem.
>
>Moose
>
>Dave@xxxxxxxxxxxxxxx wrote:
>
>>All,
>>
>>Interesting thing here -- help please!
>>
>>Lacking the $$$ for an E10/20 OR a polaroid back for my OMs, I've
>managed to
>>get the benefits of digital proofing for a studio lighting setup
>in the past
>>by setting up the studio lights, then shooting the subject with a cheap
>>little HP 315 digital with a slave & sync cord to the monolights
>in front of
>>the HP's onboard flash and a ND filter in front of it's lens.
>Ungainly, but
>>it worked!
>>
>>Now I've gone & "upgraded" to a Canon SureShot A20, mainly for the optical
>>zoom that the HP lacks.  Same setup re slave as the HP, but now
>the flash is
>>NOT sync'd.  I've tried every setting on the camera (manual/automatic,
>>auto-flash/manual flash/redeye/etc) to no avail.  I've played
>with the power
>>setting on the monolights hoping that that would increase the
>flash duration
>>to better catch the shutter opening, but that hasn't helped.  Heck, I've
>>even fired the cam directly at the monolight's built-in slave sensor with
>>the same lack of results.
>>
>>Given that the Canon flash/slave/sync cord/monolight firing is virtually
>>instantaneous, it seems to me that the shutter opening and the
>flash firing
>>should all happen at the same time, giving me my digital previews.
>>
>>But NO!!! :)  I find it difficult to believe that the shutter on the canon
>>is so fast as to be affected by any lag in the slave triggering process.
>>Per the docs, it shoots at a steady ISO100...
>>
>>Any ideas?
>>
>>TIA!
>>
>>Dave
>>
>>
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>>
>>
>
>
>
>
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