lens is lightly used. No cosmetic Damage. No mechanical damage and is in perfectly working condition. 

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The ultra-wide-angle zoom pioneer, SIGMA has developed and launched many extraordinary products in this category over the decades. Now SIGMA introduces an ultra-wide-angle zoom lens that is perfect for the era of ultra-high resolution digital cameras.

The SIGMA 12-24mm F4 DG HSM | Art offers an optimal package of center-to-edge image quality, minimized distortion, and minimum focusing distance. To achieve these qualities without compromise, SIGMA has leveraged its lens design expertise and all of its leading-edge technologies. Advanced materials such as low-dispersion glass play a crucial role, while SIGMA's advanced lens processing methods have made possible an aspherical lens of extremely large diameter.
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ART 12-24mm F4 DG HSM Specifications

Lens construction16 elements in 11 groups
Minimum apertureF22
Angle of view (35mm)122.0°-84.1°
Minimum focusing distance24cm* / 9.4in. *At 24mm end of the zoom range
Dimensions (diameter × length)102.0mm × 131.5mm / 4.0in. × 5.2in.
Number of diaphragm blades9 (Rounded diaphragm)
Maximum magnification ratio1：4.9
Weight1,150g / 40.6oz.
Edition number*A016
* About Edition numberThe three-digit code on the surface of the lens is to indicate the year the lens was first released. (Since it is different from the year of manufacture, the release year and edition number may not match depending on the mount.)