Archived posting to the Leica Users Group, 2000/09/19

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Subject: Re: [Leica] M6 TTL questions
From: John Collier <>
Date: Tue, 19 Sep 2000 12:05:45 -0600

When the SF-20 flash is set to TTL, the f stop setting is just so the flash
can display the correct distance range for the user. The f stop setting (in
TTL mode) has no effect on light output. I do not even bother to set the f
stop setting on the flash and just concern myself with the exposure
compensation setting.

John Collier

> From: "Dances_with Leicas" <>
>> Quantum tells me
>> that the TTL adaptor for the M6 TTL is the same one as for the R8, but
>> they didn't seem very sure of this. The Leica site also seems to hint
>> that when describing the SF-20 but if anybody has any direct experience
>> of the functionality of an R8 compatible flash on the M6 TTL I'd love to
>> hear it.
> It is the same, or very similar, and it works quite nicely.
>> Obviously, I know that it won't set the synch speed, but I'd
>> like to know about the TTL capability and viewfinder display.
> Actually, all of the gee-whiz-golly features that one expects with TTL
> flash are not there on the M. It can't set sync, and it even has no idea
> what the Fstop you have set --- Remember, it is an all manual camera!
> You select the Fstop on the flash, say 5.6, put that on the lens, set the
> camera to sync or slower and everything looks wonderful. If you change your
> apature it will either under or over expose your flash.
> As for viewfinder sisplay, there is a cute little lightning bolt  when the
> flash is charged.
> yes, in operation it is not much different from a thyristor flash, but the
> results are incredible!