Edmund Scientific adopts new polishing method

This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

Problem is, it will not make optics cheaper for consumers, but increas the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap, but
once they substitut one of the lens with an ED or florite lens, it cost 10
times more.

Julius

"Richard" wrote in message
om...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

Problem is, it will not make optics cheaper for consumers, but increas the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap, but
once they substitut one of the lens with an ED or florite lens, it cost 10
times more.

Julius

"Richard" wrote in message
om...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

You really don't wonder, Julius, and you know it. g

Best regards,
Bill

"Szaki" wrote in message
news:gzmac.140459$Cb.1494837@attbi_s51...
Problem is, it will not make optics cheaper for consumers, but increas the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap,
but
once they substitut one of the lens with an ED or florite lens, it cost 10
times more.

Julius

"Richard" wrote in message
om...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

You really don't wonder, Julius, and you know it. g

Best regards,
Bill

"Szaki" wrote in message
news:gzmac.140459$Cb.1494837@attbi_s51...
Problem is, it will not make optics cheaper for consumers, but increas the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap,
but
once they substitut one of the lens with an ED or florite lens, it cost 10
times more.

Julius

"Richard" wrote in message
om...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

On Tue, 30 Mar 2004 22:31:40 GMT, "Szaki" wrote:

Problem is, it will not make optics cheaper for consumers, but increas the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap, but
once they substitut one of the lens with an ED or florite lens, it cost 10
times more.

Julius

"Richard" wrote in message
. com...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Most glass houses price glass relative to BK7. That is say F4 will
cost 2.5 times more than BK7. BK7 is the most common and produced
borosilacte crown optical glass. Other glass mixtures will used boron,
titanium, lanthanum, and many other chemicals as dopings to alter the
index of refraction and dispersion cefficient (Abbe Number). Some
mixtures can only be done is small vats and some are not often used.

Flourite glass is actually Calcium Flourite. It is not a silicate
glass. It is found naturally be often not in clear form. Most common
among the Southwest US and northern Mexico is a purple crystal. At one
time I heard that there was only one Japanese company producing
Calcium Flourite for optical use. A very expensive process compared to
BK7. Price multiplier for Flourite is about 60 times. So if a 100mm
diameter 20 mm thick of BK7 cost you $25, the same size Flourite is
$1,500. ED, Extra low Dispersion, glasses are about 20 to 30 times
multiplier. As more of this type of glass is used then the cost can
come down.

The most common crown flint is achromats is probably BK7 and F2 or F4.
A six inch set of blanks are about $50 to $100 using BK7 and F4.
Depending on whether you have curves generated or not.

james

On Tue, 30 Mar 2004 22:31:40 GMT, "Szaki" wrote:

Problem is, it will not make optics cheaper for consumers, but increas the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap, but
once they substitut one of the lens with an ED or florite lens, it cost 10
times more.

Julius

"Richard" wrote in message
. com...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Most glass houses price glass relative to BK7. That is say F4 will
cost 2.5 times more than BK7. BK7 is the most common and produced
borosilacte crown optical glass. Other glass mixtures will used boron,
titanium, lanthanum, and many other chemicals as dopings to alter the
index of refraction and dispersion cefficient (Abbe Number). Some
mixtures can only be done is small vats and some are not often used.

Flourite glass is actually Calcium Flourite. It is not a silicate
glass. It is found naturally be often not in clear form. Most common
among the Southwest US and northern Mexico is a purple crystal. At one
time I heard that there was only one Japanese company producing
Calcium Flourite for optical use. A very expensive process compared to
BK7. Price multiplier for Flourite is about 60 times. So if a 100mm
diameter 20 mm thick of BK7 cost you $25, the same size Flourite is
$1,500. ED, Extra low Dispersion, glasses are about 20 to 30 times
multiplier. As more of this type of glass is used then the cost can
come down.

The most common crown flint is achromats is probably BK7 and F2 or F4.
A six inch set of blanks are about $50 to $100 using BK7 and F4.
Depending on whether you have curves generated or not.

james

Ouch

"Bill Becker" wrote in message
...
You really don't wonder, Julius, and you know it. g

Best regards,
Bill

"Szaki" wrote in message
news:gzmac.140459$Cb.1494837@attbi_s51...
Problem is, it will not make optics cheaper for consumers, but increas
the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap,
but
once they substitut one of the lens with an ED or florite lens, it cost
10
times more.

Julius

"Richard" wrote in message
om...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

Ouch

"Bill Becker" wrote in message
...
You really don't wonder, Julius, and you know it. g

Best regards,
Bill

"Szaki" wrote in message
news:gzmac.140459$Cb.1494837@attbi_s51...
Problem is, it will not make optics cheaper for consumers, but increas
the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap,
but
once they substitut one of the lens with an ED or florite lens, it cost
10
times more.

Julius

"Richard" wrote in message
om...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

james wrote in message . ..
On Tue, 30 Mar 2004 22:31:40 GMT, "Szaki" wrote:

Problem is, it will not make optics cheaper for consumers, but increas the
profit margin for the company.
I never can figure out, why an achromat lens (crown and flint) is cheap, but
once they substitut one of the lens with an ED or florite lens, it cost 10
times more.

Julius

"Richard" wrote in message
. com...
This is the one that supposedly could make aspheric products cheaper.

http://optics.org/press/6498

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Most glass houses price glass relative to BK7. That is say F4 will
cost 2.5 times more than BK7. BK7 is the most common and produced
borosilacte crown optical glass. Other glass mixtures will used boron,
titanium, lanthanum, and many other chemicals as dopings to alter the
index of refraction and dispersion cefficient (Abbe Number). Some
mixtures can only be done is small vats and some are not often used.

Flourite glass is actually Calcium Flourite. It is not a silicate
glass. It is found naturally be often not in clear form. Most common
among the Southwest US and northern Mexico is a purple crystal. At one
time I heard that there was only one Japanese company producing
Calcium Flourite for optical use. A very expensive process compared to
BK7. Price multiplier for Flourite is about 60 times. So if a 100mm
diameter 20 mm thick of BK7 cost you $25, the same size Flourite is
$1,500. ED, Extra low Dispersion, glasses are about 20 to 30 times
multiplier. As more of this type of glass is used then the cost can
come down.

The most common crown flint is achromats is probably BK7 and F2 or F4.
A six inch set of blanks are about $50 to $100 using BK7 and F4.
Depending on whether you have curves generated or not.

james

And yet somehow, they manage to sell refractors from Takahashi for
$1900 with 100mm fluorite lenses in them.
It's expensive, but not that much.
-Rich