Dave:
Leica has a scheme for naming their lenses:
Summicron = f/2.0
Summilux = f/1.4
Noctilux = f/1.0
I assume that it is derived from the German for night ("nacht').
Bill Stanke
----- Original Message -----
From: <DBellamy2k@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Wednesday, August 01, 2001 7:34 PM
Subject: Re: [OM] 50mm 2.0 macro lens > 50/1.2 > Noctilux > vignetting.
> In a message dated 02/08/01 02:23:53 GMT Daylight Time,
> owner-olympus-digest@xxxxxxxxxxxxxxx writes:
>
> << If you want to see some VERY NICE F/1.0 shots taken with a Leica
Noctilux,
> you should check this link out. (Personally, I think at ~$2k and 630g,
the
> Noctilux is grossly overpriced, but some can stomach it's price and
weight.)
> http://www.shinozuka-family.com/f1/ >>
>
> If I could afford Leicas, I would HAVE to have one, whatever. It's an f/1
> after all! And what a beautiful name, Noctilux. "Night light"? As in
> noctilucent clouds? I was intrigued by the meaning of "Zuiko" too on the
> e-sif site.
>
> But that's all out of my league, never mind.
>
> I see the vignetting on those pictures as Ken mentioned. Now a question:
>
> Is vignetting the same as so-called image fall-off attributed to
ultra-wide
> angles like the 18/3.5? Do they have the same cause? Or are there several
> causes? I wondered if the huge taking angles of lenses like the 18mm meant
> that when the light is 'bent around' to appear on the image and the image
is
> stretched out to give straight lines in the corners, does that
automatically
> cause light intensity fall-off? I suspect that it might.
>
> I assume that vignetting is usually caused by something getting in the way
of
> the optical path, or part of it.
>
> Dave Bellamy.
> http://members.aol.com/synthchap/
>
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