Genuine Sigma LH878-03 Lens Hood is designed specifically to fit the Sigma 24-70mm f/2.8 DG DN HSM Art Lenses (Note: this is for DG DN lenses in Leica / Panasonic L- Mount and Sony E-mount). It is NOT designed for the OS versions. Original replacement / spare lens hood. The LH878-03 can protect the front element of the lens from light impact and damage. Lens hoods block stray light to help prevent light issues such as flare or ghosting.