This is Canon's classic L-series wide-angle zoom lens, the "EF 17-40mm F4L USM." This lens is ideal for landscape, architecture, and snapshot photography, and is known for its high descriptive power and contrast. I purchased this item this year as a used "A-grade" product, considered to be in excellent condition, from a camera specialty store. After purchase, I used it with a genuine protective filter attached. I have not used it for outdoor photography, only indoors. It has been stored in an environment with constant air conditioning and minimal humidity changes. I can't see any mold or fogging inside the lens with the naked eye, and it's in a clear condition. The exterior also has few scratches and is generally clean. The AF, zoom, and aperture operations are also problem-free. The protective filter has some scratches from normal use. Accessories include front and rear caps, a protective filter, a hood, and a lens case. All are genuine Canon products. Please also check the condition in the photos. I will carefully pack and ship it. Recommended for those looking for a good quality used item. Shipping method: Yu-Pack Shipping included - Brand: Canon - Model: EF 17-40mm f/4L USM - Filter size: 77mm - Hood: EW-83E - Lens case: LP1319 Canon Model Name...EF 17-40mm F4L USM Focal length (wide angle side)...13-18mm Focal length (telephoto side)...36-50mm Open F value...2.9-4