Sigma 105mm F2.8 EX Macro allows greater working distance between the lens and subject. High contrast and excellent image quality are made possible in all shooting ranges. An easy to use 105mm medium telephoto lens Sigma 105mm F2.8 EX Macro lens is very suitable for taking pictures in nature and it enables to use of natural light conditions or flash.The greater working distance of this lens is very advantageous when taking the picture of a flower among the branches or an insect. You do not shake your subject when you want to take its precise details without blurring by using a tripod.The narrow angle of view is a great aid for simplifying backgrounds and shallow depth of field makes it easier to handle the composition. Reduces flare and ghost This new medium telephoto macro lens employs a new design concept for digital SLR cameras. Its new lens power layout produces an excellent optical performance and also reduces flare and ghost. This new lens is designed to reduce the influence of harmful light caused by reflections from the digital image sensor. Minimum aperture of F45 Depth of field of medium telephoto macro lenses is generally very shallow; however, Sigma, Canon and Minolta/Sony mounts of this lens have a minimum aperture of F45 (or F32 for Nikon and Pentax mounts) for incredible depth of field. Screw-in lens hood A screw-in hood is included, for convenient use of circular polarizing filters. It is possible to attach an 77mm filter in front of the lens hood. Dual Focus (DF) system This lens also incorporates a Dual Focus (DF) system that is designed to make the lens easy to hold during auto focusing. The large focus ring offers smooth and positive action whilst focusing manually.