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 EX Lens
With uncompromised design ideas and high-level optical technology and handling, these lenses, which are Sigma's representative lenses, meet the requirements of photographers at the highest level.
 Aspherical Lenses
The aspherical lens complex allows freedom of design, with high lens performance, a reduced number of component lenses and a compact size.
 APO Lens
Using SLD, ELD, and other special low-dispersion glass ,these lenses are designed to minimize chromatic aberration and deliver the best image quality possible.
 Optical Stabilizer (OS)
this is a feature built into lenses that compensates for camera shake. It dramatically expands the realms of photography by alleviating camera movement when shooting hand held.
 Hyper-Sonic Motor (HSM)
HSM lenses are equipped with a motor driven by ultrasonic waves. the motor makes high AF speeds and quiet shooting a reality.
 Rear Focus
RF lenses are equipped with a focusing system that moves the rear lens group for high-speed, silent focusing.
 Inner Focus
IF lenses are equipped with a focusing system that moves the inner lens group without changing the lens' physical length of the lens. thereby ensuring excellent stability in focusing.
 Teleconverter-Compatible Lens (CONV)
The "CONV" mark designates lenses that can be used with the APO Teleconverter EX (sold separately). The Teleconverter increase the focal length and interface with the camera's AE (automatic exposure) function of the lens.
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