ISO: Cobalt Lenses

[Eighties Man]

Looking for cobalt shade #10 lenses

[astaindsoul5446]

I think they discontinued most of them because they were causing eye damage, but may be wrong.

[farmall]

There was a thorough post, I think on these forums, as to why American Optical quit making them because they were too expensive/had low yield of good glass from a batch.

Cobalt "furnace observation" lenses in Shade 5 and 6 turn up and you can stack 'em, but vendors won't produce any 10s.

Auralens won't because of safety issues. This is their excellent explanation to me when I inquired.

Because of the low spectral transmittance of the cobalt filter, adding UV and IR filtration via secondary and tertiary filters would render the filter black and unusable, additionally, the added thickness would make it near impossible to fit into a goggle or hood.

If you don't care you could stack two of Auralens very nice blue lenses, but they are not intended for welding.

Schott lenses are available in 6 and 8, but two 6s may be a bit much.

http://www.ebay.com/itm/Schott-Cobal...item746d066577

[Spar-X]

I see them on eBay from time to time, supply and demand really knock the shock factor into the price,
seems no one else wants to reproduce these......