The Sigma Corporation (COO: Kazuto Yamaki, Kawasaki-Shi, Kanagawa) is pleased to announce that FLD (F Low Dispersion) glass, which has a performance equal to fluorite glass, has been adopted and used in our new high performance lenses. FLD glass is the highest level low dispersion glass available with extremely high light transmission. This optical glass has a performance equal to fluorite glass which has a low refractive index and...(read more)
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Sun, 2010-02-21 00:25