the Sigma 24-105mm f/4 DG OS HSM Art The Sigma 24-105mm f/4 DG OS HSM Art is a standard lens compatible with many cameras that work in APS-C and FullFrame formats, an example of which are the Canon EF series and the Nikon F. This component is equipped with ultrasonic autofocus and image stabilization. The Sigma 24-105mm f/4 DG OS HSM Art features 19 lenses distributed across 14 different optical groups; it is built exclusively with good quality metal materials. Sigma preferred not to use plastic under any circumstances. These characteristics make the lens highly performing and capable of guaranteeing first-class brightness and sharpness; the presence of stabilization simplifies its use and makes it possible to take photographs even in particularly difficult conditions. The photos taken with the Sigma 24-105mm f/4 DG OS HSM Art are the synthesis of the technology used to build this component; in addition to the brightness, the contrast is also of an excellent level and contributes to making the colors very bright and characterized by splendid chromatism. The photos are very detailed and never lose definition, even near the edges; it is difficult to find a flaw in this lens which costs around 800 euros, money definitely well spent in relation to what is offered. Ideal for: this is a lens suitable for professionals and all photography enthusiasts who want more than an amateur product.