[pure-silver] Re: <somewhat OT> New lens design technology
- From: Sauerwald Mark <mark_sauerwald@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 1 Feb 2007 18:27:44 -0800 (PST)
That is true, but for a conventional lens there is a
limit to the diameter that you can make a lens and
still maintain a given focal length, with this
arrangement, there is not a limit - as the disk gets
larger, you have more internal reflecting surfaces
(those would be equivanent to the elements in a
conventional lens), and the aperture would grow as the
square of the diameter - so a larger lens gets more
and more light gathering capability. Also, in a
conventional lens, there is a fairly large amount of
light loss from passing through the air-glass surface,
in this case the entire light path is within one piece
of glass, so those losses should be minimal - think of
how many internal reflections light has when
travelling through a piece of fiber optic cable.
--- Peter Badcock <peter.badcock@xxxxxxxxx> wrote:
> On 02/02/07, Sauerwald Mark
> <mark_sauerwald@xxxxxxxxx> wrote:
> >
> > ......... I believe that because
> > of the way the lens is formed, it would be
> possible to
> > make lenses with speeds faster than f1.
> >
> >
> Isn't the "light gathering power" of a lens
> proportional to the surface area
> of the input aperture? If so then such a lens
> design will have much less
> light gathering power compared to a conventional
> lens (assembly) of the same
> diameter.
>
> regards
> Peter
>
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