This lens establishes a new benchmark as a standard lens, extending from a wide 28mm all the way to 105mm telephoto, all with a fast constant 2.8 maximum aperture. The use of four large diameter aspherical elements and three LD glass elements reduces various aberrations while minimizing the fall-off of light at the corners. Tamron's Integrated-Focusing Cam system, Internal Focusing system and Triple-Cam zoom system all combine to permit a body that at the 28mm zoom position is very compact, with excellent optical performance. Also, a new Anti-Slip-Mode
mechanism is incorporated for the first time.
Auto focus lens Maximum Aperture: f/2.8 Minimum Aperture: f/22-32 Optical Construction: 13 Groups/15 Elements Focusing System: Internal Focusing Filter Size: 82mm Minimum Focus: (0.5m) throughout range MaximumMagnification Ratio: 1:4.7 (f=135mm) Overall Length: 4.2" Weight: 30.3 oz. Included Accessory: Lenshood