The Sigma 300-800mm f/5.6 EX DG is an extreme telephoto zoom lens, ideal for nature/outdoor or sports photography. This translates into an equivalent range of 600-1600mm when used with an Olympus digital SLR camera. This lens provides a relatively large constant f/5.6 maximum aperture at all focal lengths.
The use of Apochromatic design and 2 ELD (Extraordinary Low Dispersion) glass elements give full correction of chromatic aberration and provide a high level of optical performance.
The improved DG lens design corrects for various aberrations. This lens is specially coated to get the best color balance whilst cutting down on ghosting caused by reflections from the digital image sensor. The lens provides the utmost correction against lateral chromatic aberration which is a serious problem for digital SLR cameras.
It is also possible to use this lens with Sigma 1.4x EX and 2x EX Apo Tele Converters to convert this lens into an ultra tele-zoom lens, effectively converting it into a 420-1120mm f/8 or 600-1600mm f/11 lens.