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| Tips, Techniques, and Questions -- Technical questions or tips |
2010-11-19, 3:42am
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Senior Member
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Join Date: Aug 09, 2008
Location: Grand Rapids, MI
Posts: 1,086
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didy's
What exactly are didy lenses? Is it just a plain lens with a purple dye or is it more involved than that?
Caroline
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2010-11-19, 7:51am
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Glass-aholic
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Join Date: Mar 21, 2007
Location: CT, tolland CT
Posts: 4,332
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it is more than that. Didymium lenses are a special material/coating that filter out the soda flare and some UV light. I am not sure if they are coated, I think they can be now, but were not previously. I believe it has something to do with filtering out part of the red's/yellow in color spectrum on some level.
edited to add: found a link with some history.
http://www.sa-clayartists.com/MooseForge/didymium.html
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hand dyed silk ribbons in many colors!
WASHERS & TOPPERS - layering components for interchangeable glass topper and to use in other jewelry/metalwork.:
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2010-11-19, 9:40am
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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Didymium is a special glass made with rare earth colorants (heavy metals) that absorb the orange fire ball (flare) that surround moltent glass... Actually Didymiun glass is no longger in productions and any new didymum glasses availabel are from last batch of didymium glass made (not a bad thing)...
http://en.wikipedia.org/wiki/Didymium
The replacement of didymium glass is ACE 202 glass, which has same properties to block orange flair and allow you to see the actually glass and not the orange "light" flare...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2010-11-19, 10:33am
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Curmudgeon Engineering
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Join Date: Feb 15, 2006
Location: Near Seattle, WA
Posts: 1,723
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I've been told but have no varification that China controls all the production of rare earth menerals. They recently cut off supplies to Japan in retaliation in the dispute over some islands of their coast.
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2010-11-25, 11:45pm
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Senior Member
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Join Date: Aug 09, 2008
Location: Grand Rapids, MI
Posts: 1,086
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Thanks all!
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2010-11-26, 12:28am
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Senior Member
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Join Date: May 04, 2007
Location: San Jose, CA
Posts: 1,212
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Didys .... This has become sort of a 'generic' term ...
Originally, didymium glasses were developed (a *long* time ago) for scientific lampworkers to filter out the *just* yellow sodium flair. Newer glasses filter out much more than that.
The newer glasses (all using the same Schott glass for the lens) offer much better protection in the IR and UV spectrums, as well as filtering out the yellow Sodium flair. This glass is not coated; instead, it has the filtering properties included when the glass (for the lens) is made.
So, while 'Didys' has become a generic term, the current glasses (while not *just* didymium) offer much more protection than the 'original' didymium glasses.
Malcolm
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