Archived posting to the Leica Users Group, 2001/11/23
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>Dear Ray,
>I simply _can't believe_ that vigneting could be the cause of your problem!
>M6 is metering just the centre of the frame.
>
>Martin
>
>
>
>Dear All,
>
>Thanks to all who responded to my question about the behaviour of the
>M6 TTL meter with the 50/1.4 Summilux-M lens at wide apertures. I have
>been waiting for a reply to this question from Leica but so far no
>luck.
>
>Basically, the M6 TTL meter seems less responsive to changes in
>aperture around f/1.4-f/2 than at narrower apertures. Sometimes it
>behaves as if changing from f/1.4 to f/2 is only a half-stop
>difference; at other times, it doesn't respond at all. The meter always
>reponds normally to changes in shutter speed, however. I doubt if
>there's anything wrong with the camera or the lens, I just think it
>must a phenomenon due to vignetting, as suggested.
>
>The suggestion from list members that made the mose sense to me was
>that vignetting could be confusing the meter. My 50 'lux is the one
>previous to the current model, with separate metal slotted shade. I
>have tried taking readings without the shade attached but I can't see
>that it makes any difference.
>
>When I eventualy hear from Leica on this, I'll share their response
>with the list.
>
>Regards,
>
>=====
>Ray
Vignetting (due to the lens element sizes and barrel construction;
the shade causes no vignetting) is exactly what is causing this. See
my previous post for details.
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* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:henningw@archiphoto.com
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