Ivor and Olive Lewis on thu 14 oct 04
Dear Helen,
Makes a change from 'Plastic'.
But we are told nothing are we?
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Louis Katz on fri 15 oct 04
If the material is a solid rather than a glass like quartz perhaps.
Seems like it probably had some regular structure.
Louis Katz
http://www.tamucc.edu/~lkatz
Fredrick Paget on fri 15 oct 04
> > What do you call a ceramic material that is optically pure?
>> Wouldn't be "GLASS" would it?
>
>Leonard -
>I wondered about this too. The clay and glazes we use all exist along a
>ceramic continuum, with the most refractory brick products at one end, and
>pure glass at the other end, so it does seem a bit odd to refer to a
>"ceramic" camera lens. After all, according to some definitions of
>"ceramic," all camera lenses are ceramic unless they are plastic. I would
>love to know what would make a transparent material a "ceramic" material
>rather than just "glass." Whoever posted the original message, we'd like
>more information please.
>Best wishes -
>- Vince
Casio's ceramic lens Wed, 4 Aug
Casio has announced the development of a new lens for compact
cameras which is made from a transparent ceramic material instead
of glass. The material (Lumicera) was originally developed for
other applications but happened to have interesting optical
properties including a higher refractive index than glass. Casio...
http://www.dpreview.com/news/0408/04080401casioceramiclens.asp
--
From Fred Paget, Marin County, California, USA
fredrick@well.com
Fredrick Paget on fri 15 oct 04
>
Another URL:
LUMICERA, a transparent ceramic developed by Murata Manufacturing Co., Ltd.
http://www.murata.com/opt/lumicera.htm
Fred
--
From Fred Paget, Marin County, California, USA
fredrick@well.com
Leonard Smith on fri 15 oct 04
What do call a ceramic material that is optically pure?
Wouldn't be "GLASS" would it?
Could be a clear glaze?
Leonard Smith
Rosedale Street Gallery
2A Rosedale Street
Dulwich Hill NSW Australia 2203
Email: leonardsmith@optusnet.com.au
http://www.rosedalestreetgallery.com
Vince Pitelka on fri 15 oct 04
> What do you call a ceramic material that is optically pure?
> Wouldn't be "GLASS" would it?
Leonard -
I wondered about this too. The clay and glazes we use all exist along a
ceramic continuum, with the most refractory brick products at one end, and
pure glass at the other end, so it does seem a bit odd to refer to a
"ceramic" camera lens. After all, according to some definitions of
"ceramic," all camera lenses are ceramic unless they are plastic. I would
love to know what would make a transparent material a "ceramic" material
rather than just "glass." Whoever posted the original message, we'd like
more information please.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/
Ivor and Olive Lewis on sat 16 oct 04
As I said Leonard, goodbye to plastic camera lenses
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Dewitt on sat 16 oct 04
http://www.stanford.edu/group/SPRC/Report/poster/wisdom.pdf provides an
overview of optically transparent polycrystalline ceramics, what they are
made of and how.
deg
Leonard Smith on sun 17 oct 04
Sorry if I sounded a little flippant, but the point I was trying to make was
that calling it "Ceramic" instead of glass may be just marketing.
This appears to be a special glass and is therefore ceramic, but by every
definition I know, soda glass is ceramic also (BTW so is concrete).
The marketing as "Ceramic" is a little like a few years ago when Titanium
was the BUZZ material.
Of course this does not undermine the significance of the research and
development that went into the new lens nor its capabilities. I would
certainly prefer it to a plastic lens.
Leonard Smith
Rosedale Street Gallery
2A Rosedale Street
Dulwich Hill NSW Australia 2203
Email: leonardsmith@optusnet.com.au
http://www.rosedalestreetgallery.com
> Dear Fredrick,
> A site which gives the clues to what it might be but not what it is.
> Quartz is used for Lenses. Its transmission spectrum differs from that
> of Soda silicate glass. and as you imply, is a crystalline solid, not
> amorphous.
> Any transparent medium can be used as a lens, even water. In cameras
> which complex systems of lenses the are spaces between the lenses
> exhibit optical behaviour
> Best regards,
> Ivor Lewis.
> Redhill,
> S. Australia.
>
Ivor and Olive Lewis on sun 17 oct 04
Dear Fredrick,
A site which gives the clues to what it might be but not what it is.
Quartz is used for Lenses. Its transmission spectrum differs from that
of Soda silicate glass. and as you imply, is a crystalline solid, not
amorphous.
Any transparent medium can be used as a lens, even water. In cameras
which complex systems of lenses the are spaces between the lenses
exhibit optical behaviour
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Ivor and Olive Lewis on tue 19 oct 04
Dear Leonard,
I appreciate that as the "Spin" from the on "Line Informercial" or is
it "Advertorial"
Strontium Titanate and Sr Meta-Niobate seem to have the qualities need
to give very short lens to CCD distance and a respectable hyperfocal
distance; High RI, no bi-refringence and minimum dispersion. Silicon
Carbide comes in as a good third option, except for the high
dispersion.
All the best,
Ivor Lewis.
Redhill,
S. Australia.
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