FLD不是萤石。我同事的朋友在国内开厂长萤石晶体,出口到日本。 "New lenses coming out of Sigma will be a little bit different than the company's other offerings. All of their new high end lenses will be switching from traditional glass to new F Low Dispersion (FLD) glass. It's got the same performance as fluorite glass but it's much cheaper."