Re: [Leica] Metering anomaly on M6 TTL with Noctilux

["Simon Lamb" <simon@sclamb.com>]

Christer

The battery is fairly new and I do not have this problem with any other
lens, which is what prompted me to ask if it was a Noctilux issue.  I have
yet to read the article that was suggested so I have yet to understand the
vignetting causing it.  I can understand low batteries causing exposure
problems though.

Simon

Christer Almqvist wrote:
>
> I had a somewhat similar problem some time ago although not with a
> Noctilux. I turned out to be the battery, it was getting very low and the
> little red arrows took much longer than normal to react. I had the camera
> on a tripod, and I was much quicker changing the shutter speed than the
> aperture (or the other way round). Initially, the result was that one
> aperture stop was not (__immediately__) offset by one shutter stop the
> other way, at least not if one was to believe the red arrows. After a
> couple of seconds it was back to normal, but I was not used to there being
> any delay at all and I was utterly confused. I tried out my second body
and
> had no problem, and then realized it was the battery tha caused the
> problem. I have to admit thought, that the more likely solution to your
> problem  is the one below.
>
> Chris
>
>
>
> >I have noticed something strange with the metering on my M6 when using a
> >Noctilux.  In order to explain in as few words as possble I will use the
> >following symbols to show the symbols that are present in the viewfinder:
>
> >o <
> >
> >I was intending to take a picture at f/1 and at 1/60 second the
viewfinder
> >reading was  > o  (1/2 stop underexposure)
> >As I was at f/1 I set the shutter speed to 1/30 second and the viewfinder
> >reading was  o <  (1/2 stop overexposure, as you would expect)
> >
> >I assumed that if I rotated the aperture ring to the 1/2 stop between f/1
> >and f/1.4 I would get a viewfinder reading of  o  (correct exposure), but
> >what I got was still  o <  (1/2 stop underexposure).
> >
> >I has to set an aperture of f/1.4 before I got a viewfinder reading of  o
> >(correct exposure).
> >
> >It appears that instead of f/1 at 1/60 second being the same as f/1.4 at
> >1/30 second it is actually an additional 1/2 stop.  This is not in
general a
> >major issue as 1/2 stop in many cases is barely noticeable, but I
wondered
> >if anyone else had noticed this happening.  However, I was using Scala
> >pushed to 400 and 800 and the 1/2 stop does make a difference.  I am
using
> >an M6 .85 TTL with the Noctilux.
> >
> >Simon
>
>
> --
> Christer Almqvist
> D-20255 Hamburg, Germany and/or
> F-50590 Regnéville-sur-Mer, France
>
>
>