Archived posting to the Leica Users Group, 2002/02/25

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Subject: Re: [Leica] Re: Question on the M7 and the Metz 54 MZ-3
From: Henry Ting <henryting10@yahoo.com>
Date: Mon, 25 Feb 2002 15:03:12 -0800 (PST)

Thanks Eric.
At this point the more I tried to understand it, the
more questions come up. Still, how does the strobing
prevent the overlapping of exposure between the
curtain travelling across and the flash. I
understanding strobing in the old sense, where we can
strobe the flash to freeze multiple movement images.
But this integration between the M7 and the Metz can
utilize the 1/1000 shutter speed needs better analysis
as to how it works. The precision between the curtain
travelling horizontally and the strobing from the
flash is black magic to me. Besides, if this function
is only capable with manual flash, why all the prevous
Ms cannot utilize the HSS mode. 

- --- Eric <ericm@pobox.com> wrote:
> Henry:
> 
> >I tried the HSS mode on the Metz54 manually and its
> >just a strobe flashing. Does it mean it will strobe
> as
> >the shutter curtain moves horizontally ? 
> >Also how does the flash sync up with the shutter's
> >travelling speed if indeed this is possible. 
> >I would imagine, the syncing has to be perfect
> between
> >the shutter and the flash unit to avoid exposure
> >overlapping as the flash strobes.
> 
> That's just it...it doesn't need to sync up.  The
> flash strobes from the
> time the first curtain starts moving 'til the time
> the 2nd curtain stops.
> Instead of having a flash exposure of 1/20,000 (or
> whatever) in the middle
> of when both curtains are completely open at the
> 1/50th, speed, you'll have
> multiple bursts spread out over 1/250, 1/500, or
> 1/1000th of a second.
> 
> It's almost as if you're turning on a light for the
> duration of the shutter.
> Except that light gets brighter and dimmer
> throughout...cancels out.  :)
> 
> I've had this feature on my Nikon N90 since 1990 and
> I don't remember using
> it after the first couple rolls.  It was neat...but
> it means you're using
> the flash on manual.  No TTL.  No auto shutoff.  Get
> out either your flash
> meter or your guide number chart.  Oh...and *really*
> increases battery
> consumption by the flash, too.  :)
> 
> 
> Eric
> --
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Replies: Reply from "Eric" <ericm@pobox.com> ([Leica] Re: Question on the M7 and the Metz 54 MZ-3)