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Re: [OM] T20 inop on Auto

Subject: Re: [OM] T20 inop on Auto
From: "C.H.Ling" <chling@xxxxxxxxxxxx>
Date: Thu, 18 Jan 2001 14:39:56 +0800
Sorry, I don't know what is quench tube (quench tube was not mentioned
by me), I just know the T20 I once own can adjust its output at auto
mode and TTL-auto mode, it did change with lens aperture in TTL auto.
The recycle time is depends on the output power. 

C.H.Ling 

"JUANITA M. ALMEDA" wrote:
> 
> 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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