Tamron 70-200mm f/2.8 Di LD (IF) Macro AF Lens for Canon with 77mm 3 Piece Filter Kit (UV+FLD+CPL), More - International Version (No Warranty) 70-200mm Telephoto Zoom Lens Two LD glass elements reduce various aberrations while minimizing the fall-off of light at the corners The lens neither extends nor contracts physically when focusing; all moving elements are contained within the lens barrel Digitally Integrated (DI) design lenses are designed to meet the performance characteristics of digital SLR cameras The tripod mount (included), detachable in one touch, is made of magnesium alloy that reconcile lightweight and high rigidity, resulting in enhanced balance and ease of use in hand-held shooting