I have just purchased one of your DC lenses but I am getting a black line around the edge of my pictures. Is the lens faulty?

Sigma’s DC lenses are designed to work on digital SLR cameras with an image sensor which is smaller than 35mm film (known as APS-C size). If you use one of these lenses on a film or full frame digital SLR, you will get a line (called vignetting) around the edge of the picture. Please use a lens from our DG range as these will be suitable.