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[OM] Couple quick T28 twin flash Q's

Subject: [OM] Couple quick T28 twin flash Q's
From: usher99@xxxxxxx
Date: Sat, 29 Aug 2009 22:37:00 -0400
Yeh,
Manual GN is weird.  This high voltage thread jolted my memory now.  I 
recall Tim commented about two years ago that the
tubes are in series (no independent supplies) and the conversion 
efficiency is reduced with two tubes.  I believe he said there also was 
more juice left in the cap as it fires to the extinction voltage of the 
tube  and not to 0 and thus more juice is left in with two tubes in 
series.

Now need to decide whether to try Portra 400 VC-3 or try to carry 
around the T28  in the hot shoe and a T32 on one of the Lepp bracket 
arms and try Ektar 100 or Portra 160 for the lepidoptera outing.  Not 
sure how Walt manged with his bug portrait rig, but with a 135mm focal 
length and the increased working distance, I usually don't have enough 
photons with the T28 on a Lepp bracket. He must have positioned the 
angled T28
flash closer somehow with the Kalt shoulder gizmo--never have seen what 
he was talking about.

Mike





Chuck states:


Manual is available on the eSIF. I too think the guide number is 
strange. Even stranger is that the guide number with one flash is 
higher than with two.

Chuck Norcutt


usher99 [at] aol.com wrote:

    Thanks, Piers.


     I should find a a manual for it. Seems very odd that one manual 
mode isn't just a full dump.

     Seems I can't reduce the bulk of the Lepp flash bracket T32/T28 
butterfly rig w/o the single flash version.

    Thanks again for the info--appreciated.

    Mike








    Disconnect, no (disable, yes, but that won't reduce the bulk).

     GN with one flash disabled is indeed 28 (meters, ISO 100) but only 
in TTL auto mode, according to the manual which asserts that in Manual 
mode, the GN

    is 22 (high) and 9 (low).

    Piers




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