The Sigma 12-24mm f/4.5-5.6 II DG HSM is a wide-angle lens produced from 2011 to 2018, so buying it new could be difficult; It is suitable for FF and APSC format cameras. Focusing is automatic and occurs via an ultrasonic AF motor and there is no image stabilization. The shooting angle is one of the most captivating features of this lens, it varies based on the focal length used and reaches up to 122 degrees at 12mm and drops to 84.1 degrees at 24mm. The minimum focusing distance is 28 centimeters and the lens hood is built-in so it cannot be removed. The weight and dimensions are slightly above average but do not create discomfort during use. The materials are of excellent quality and give strength and durability. The front lens is quite protruding and could be subject to scratches or accidental impacts. The images are sharp and have real colours, the flare is always present and the distortions, even if in some cases they are accentuated, are manageable in PP. The Sigma 12-24mm f/4.5-5.6 II DG HSM is suitable for all photographers looking for a lens with a wide shot, it is highly appreciated on APSC format, even if it is a very versatile lens, it is in landscapes that it is appreciate all its features. For professional use it is not a must but it can still be seen as a way to increase your kit. The cost when new is quite relative as it is difficult to find it for sale, but it can be found used and can achieve significant savings.