Would you mind explaing briefly what and how a quench tube works? How does
it limit light output if as mentioned, the T20 actually makes a full dump of
output each time regardless of aperture?
Regards
Titoy
----- Original Message -----
From: C.H.Ling <chling@xxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Thursday, January 18, 2001 1:37 PM
Subject: Re: [OM] T20 inop on Auto
> T20 cycles very fast with short subject distance in auto mode, it acts
> like T32. I have no idea about A16 but A11 gives the same recycle time
> for every shoot in auto mode.
>
> C.H.Ling
>
> HI100@xxxxxxx wrote:
> >
> > Clint wrote:
> >
> > >> The T-20 uses a "quench" tube to control the output, meaning it
> > effectively "dumps" full power every time it's fired. That means the
recycle
> > time will not vary significantly.
> > <<
> >
> > Hi Clint,'
> > the e SIF archives disagrees with you on this one :
> > " Energy-saving, series-circuit type, system electronic flash unit. "
> >
> > It is also pretty easy to test and show that the recycle time varies
with
> > distance on both ttl auto and flash sensor auto.
> >
> > You also know from all the waiting when you use it, if you have set it
near
> > it's limit!
> >
> > My memory is that it is a conventional SCR energy saving circuit. Even
the
> > A16 flash in the XA is an SCR unit.
> >
> > Regards,
> > Tim Hughes
> > >>Hi100@xxxxxxx<<
> >
>
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