The Sigma 10-20mm f/4-5.6 EX DC HSM, particularly suitable for cameras with APS-C sensor. The moment you use this product for the first time, you will immediately perceive a sensation of solidity and compactness, circumstances also supported by the weight of almost 500 grams. It is made with excellent quality plastic materials, while the focus and zoom rings are covered in soft rubber which ensures fluidity and softness in the use of the functions. Sigma used HSM technology for focusing which is a guarantee of speed in execution. The Sigma 10-20mm f/4-5.6 EX DC HSM is a wide-angle lens that ensures excellent performance thanks to an adequate focal length. The latter, in fact, is one of the aspects to take into consideration when choosing a lens and having one that can guarantee a wide range of lengths is essential for making an excellent purchase. Precisely for this reason it is important to specify that the Sigma 10-20mm f/4-5.6 EX DC HSM lens has a smaller image circle than a full-frame camera. Using this type of lens requires a certain amount of practicality and care since if you use inappropriate focal lengths, you run the risk of obtaining images where the subjects appear to be too small. the lens therefore lends itself to being used much more to immortalize landscapes rather than people to avoid them being distorted.