Hi,
I belive cannon made the 50mm f0.95 lens for its 7 type
rangefinders.(apperantly it was so heavy, the mount used to come undone from
the body!)
Gary
----- Original Message -----
From: "Malcolm Clay" <zuiko@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, July 31, 2001 6:37 PM
Subject: Re: [OM] Why is the 50mm the brightest lens?
> ----- Original Message -----
> From: "Daniel J. Mitchell" <DanielMitchell@xxxxxxxxxxxxx>
>
>
> > Just been looking at pages listing all the lenses I'd like, and I
noticed
> > that the brightness seems to peak at 50mm.
>
> Even Leica tops out at f1 with its 50mm Noctolux for the M series
> rangefinders. (Understand a f1 would be just about impossible to focus
with
> an SLR.) I seem to remember hearing that Vivitar had some kind of
super-fast
> Vivitar One series lens which was supposed to be f0.95 or some
unbeliveable
> speed. (Have no clue if this is accurate or not, never saw the lens.
> Anyone?)
>
> I am guessing that it has something to do with the optics and correcting
all
> of the aberrations at such a wide f-stop and since 50's sell the most,
maybe
> that's where they put the money. (?)
>
> I find it interesting that medium and large format lenses always seem to
be
> even slower, more in the 2.8 for medium format, and 5.6 or even 8.0 for
> large format. (210mm f5.6 Schneider APO-Symmar for example). I am guessing
> (again) that Schneider has them optimized for optic quality and lets the
> f-stop fall where it may versis the handheld world of 35mm.
>
> > I can understand why it'll fade off as the lens gets longer, because
> > there's more glass there -- but why isn't the 16mm f0.6?
>
> Thinking about how massive the Olympus 8mm f2.8 is, I went looking for a
> faster full-frame fisheye. Didn't find one, but I did find a Ni*on 6mm
> (ack!) f2.8 fisheye. (5.2kg weight) The lens dwarfs the F3 attached to it.
> Unfortunately, they don't have a photo showing the len's 220 degree field
of
> view, but rather a 8mm.
> http://www.mir.com.my/rb/photography/hardwares/speciallenses/6mmfish1.htm
>
> The "fastest" long lens (telescope camera actually) that I know of is a
> Celestron 8" (aperture) f1.5 Schmidt camera with a focal length of 300mm.
> Without any shutter, it is hardly suited for terrestrial use, but great
for
> astronomy. http://www.fayettevillenc.com/backyard/schmidt.htm
>
>
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