SKU: 2682A001. Compatible with TS-E 45mm f2.8 lens. Canon EW-79BII Lens Hood for TS-E 45mm f/2.8 Lens. Designed for: TS-E 45mm f/2.8. Lens hoods are primarily designed to prevent unwanted stray light from entering the Lens by extending and shading the Lens' end.
eBay