Sigma 28-135mm F3.8-5.6 Aspherical IF Wide Angle Telephoto Zoom Macro Lens               

Sigma 28-135mm f3.8-5.6 Aspherical IF Macro is one of several lenses introduced at PMA 2000 by Sigma Corporation. Incorporating aspherical optics, plus a floating inner focusing system, this lens minimizes spherical aberration and stigmatism. This lens can focus from infinity to 19.7 inches at all of the focal lengths without close-up accessory, and as close as 9.4 inches (1:2 reproduction ratio) at the 135mm zoom position. This lens incorporates an inner focusing system and features a non-rotating front lens barrel for convenient filter use. A custom designed "Perfect Hood" with bayonet mount is provided to prevent extraneous light from degrading the image quality.
Specifications
Construction 12 Groups / 13 Elements
Angle of view 75.4°-18.2°
F stop range 22-32
Closest Focusing Distance 50 macro (24)cm / 19.7 macro (9.4)"
Maximum Magnification 1:2
Filter Size 62mm
Dimensions (Length x Diameter) 75 x 75mm / 2.9 x 2.9"
Full Extended Length 119.5mm / 4.7"
Weight 410g / 14.5"
For Canon
For Nikon
For Pentax