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To Maintain High Optical Performance From Infinity To Close-up 1:1 (life-size) Macro Photos Without Accessories, The New Sigma 50mm F2.8 Ex Incorporates A floating Element Focusing System. Designed As A Quick-focusing Macro Lens The Af Speed Of 50mm, F2.8 Ex Macro Is 1.4 Times Faster Than Previous 50mm F2.8 Macros. It Features A Non-rotating Front Lens Group That Makes It Easier To Work With Polarizing Filters And Has A Focus Limiter (eg. Full Range; - 9.8; 9.1 - 7.4). The Sigma 50mm F/2.8 Ex Macro Lens Also Features The New Deluxe Ex External Finish.