Archived posting to the Leica Users Group, 1999/05/06

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Subject: Re: [Leica]M6-TTL Opinions
From: Mark Rabiner <mrabiner@concentric.net>
Date: Thu, 06 May 1999 20:59:35 -0700

Andrew Weis wrote:
> 
> Dear Members,
> 
> Would like opinions on the relatively new M6-TTL. How well does the
> ttl work with the new Leica flash? For fear of opening WWIII, how
> does it compare to Nikon's SB series flashes?
> 
> I appreciate any input as I am considering purchase. I am not really
> good with flash (rather new to flash use) and wanted to know if there
> are other ways to use the normal M^ with a flash unit to get similar
> shots as if ttl without having a brain cloud develop.
> 
> Thanks again,
> 
> Andrew

Most flashes have little sensors in the front of them that read the
reflected flash off the thing you are aiming it at (usually what you are
shooting with your camera).
When enough flash absorbs into the sensor it cuts the flash off so the
picture isn't too bright. This all happens in a millionth of a
microsecond...give or take...
In the TTL world the flash doesn't need to use it's tiny sensor mounted
right on the front of it. It uses the one in your camera which is
working along side your regular meter in your camera: behind the lens.
This will make for a more accurate reading but you can live without it. 
I regularly do. The one on front of the flash itself works fine and can
in some ways be easier to deal with.
Mark Rabiner
I used to get 5 or 6 not perfect exposures with regular A on the flash
sensing per 36 roll. 1 or 2 with TTL. But the ones that were off were
not off by much.