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Glossary of Terms (1)
XGM stands for Tamron's eXpanded Glass Molded Aspherical lens element.It was designed to controls distortion and chromatic aberrations that affect wide-angle lenses. It's front lens element in Tamron SP 15-30mm F/2.8 Di VC USD lens.Source:
Posted by: Radovan 29.04.2015 22:40:54