An achromat is an achromat is a Borg

Hello,
on
http://www.sciencecenter.net/hutech/newprod.htm
I read

"New Achromatic objective - 77Ach
Available as an objective tube assembly (6177) or as an SWII system set
(0070). This newly-designed achromat, utilizing ECO* glass, features a
spot size of less than 10 microns between 630nm and the green region.
Both chromatic and spherical aberrations are improved even further
compared to the 76Ach. The 77Ach supersedes the 76Ach as Borg's
entry-level Series 80 product. "

Anybody knows what ECO* glass is and how it is improving correction of
standard achromat (and also 101ED) objective ?

David

'ECO' glass and similar terms are marketing for glass made using less
polluting processes and materials. The term in and of it's self says
nothing about performance. Don't know any specifics about the Borg.

Or recycled one ?
http://japan.recycle.net/trade/EcoGlass.html
Maybe during the recycling the glass was enriched by heavy metals ?

I am joking, of course.
I remember info on this board that introduction of stricter ecologic
rules in the West stopped production of some (for telescope production
desirable) kind of optical glass.

David

Enyo wrote:

'ECO' glass and similar terms are marketing for glass made using less
polluting processes and materials. The term in and of it's self says
nothing about performance. Don't know any specifics about the Borg.

Dear David,
Fluorite glass.
best
penny

(for telescope production
desirable) kind of optical glass.

Dear Enyo,
Resistance is futile. You will be assimilated.
best
penny

Don't know any specifics about the Borg

In article ,
(PSmith9626) wrote:

(for telescope production
desirable) kind of optical glass.

Dear David,
Fluorite glass.

Isn't that fluoride glass, as used in Leica Apo lenses?

best
penny

Not to be confused with fluorite lens elements, which aren't glass, but
calcium fluoride (CaF2), as in some of Canon's L-series lenses.

(PSmith9626) wrote in message ...

Don't know any specifics about the Borg

Dear Enyo,
Resistance is futile. You will be assimilated.
best
penny

I though it went like this:

"Your ass will be laminated.
-Dyslexic of Borg
"

:-)

Dear Thad,
That's great!
Though it would be better if it were from
Dislexus of Borg.
thanks
penny

"Your ass will be laminated.
-Dyslexic of Borg

Dear steve,
Fluorite glass would be a more correct term, but they do say fluoride
sometimes.
best
penny

Isn't that fluoride glass, as used in Leica Apo lenses?

Same.