Emulating the design merits of the Tamron SP 90mm Macro, renowned and trusted by professional and amateur photographers throughout the world, the new Tamron SP AF 180mm f/3.5 Di LD (IF) 1:1 Macro Telephoto Lens for Canon Cameras is a mid-range telephoto lens that gives the user a longer working distance needed for some macro subjects. In addition, to meet the needs of this dual-format world (silver-halide and digital), the optical system of the lens is designed to provide optimum performance when used with the latest digital SLR cameras as well as film cameras.
Digitally Integrated Design, is a designation Tamron puts on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras.
This lens employs an IF (internal focusing) system that maintains the overall length of the lens during focusing. Uses two LD (low-dispersion) glass elements that effectively compensate for chromatic aberration. Provides high-contrast, outstanding image quality and a soft out-of-focus background effect. The Super Performance (SP) lens series provides high performance through outstanding design specifications.
FEC (Filter Effect Control): Features the new FEC (Filter Effect Control) function that enhances operational ease of polarizing filter use. The new Filter Effect Control is designed to rotate the filter to the desired position while the hood is attached. This is accomplished by turning the FEC ring that in turn rotates the portion of the filter mount where the filter is mounted.