All About Photographic Lenses. Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.
XGM stands for Tamron'seXpanded 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.
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