Canon Sigma Macro f2.8 EX-105mmCanon Sigma Macro f2. 8 EX 105mm A classic for close ups, the Canon EF mount 105mm f 2. 8 EX DG OS HSM Macro from Sigma is a short telephoto prime characterized by its ability to achieve a 1: 1, life size magnification along with a 1' minimum focusing distance for macro applications. The optical design employs two SLD elements to virtually eliminate chromatic aberrations and color fringing throughout the focusing range for improved clarity and color