SPECIFICATIONS:

A digitally optimised telephoto zoom lens covering ultra-telephoto up to 300mm with a fast maximum aperture of F2.8 at all focal lengths. This lens represents a revolutionary leap forward in ease of use. This was achieved by transforming a large-aperture 300mm F2.8 lens into a zoom lens that allows you to determine the picture composition you want without having to change your vantage point.

• SLD glass and aspherical lenses
  It has two SLD (the special low dispersion) glass elements in front group and another element of SLD is being used for rear group for excellent correction of chromatic aberration. The new lens coating reduces flare and ghost, a common problem with digital cameras and also creates an optimum natural colour balance. It prides excellent imaging capability like a prime lens.
• Hyper sonic motor
  The AF drive for Sigma SA, Canon and Nikon cameras is equipped with a silent, responsive and high speed HSM , which also provides full-time manual focus function.
• Sigma Apo Tele Converters (optional)
  High-speed focusing is possible when this lens is used with dedicated APO EX tele-converters (1.4x and 2x). By adding an APO tele-converter, which is sold separately, you can use this lens as a 168-420mm F4 AF tele-zoom lens with a 1.4x tele-converter, or as a 240-600mm F5.6 AF ultra-telephoto zoom lens with a 2x tele-converter. It is also possible to use AE (Automatic Exposure) function, even EX Tele-converters are attached to the lens.
• Internal Focusing and Internal Zooming
  Since focusing and zooming do not change its overall length, this lens is easy to hold and use. In addition, since the front of the lens does not rotate, a circular polarizing filter can be easily attached and use.

• Lens Construction 18 Elements in 16 Groups
  
• Angle of View 20.4 - 8.2 degrees
  
• Number of Diaphragm Blades 9 Blades
  
• Minimum Aperture F32
  
• Minimum Focusing Distance 150-250cm
  
• Maximum Magnification 1:8.6
  
• Filter Size 105mm
  
• Dimensions Diameter 113mm X Length 271mm
  
• Weight 2600g
  
  
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