This is the Canon EF 16-35mm f/4 lens. It's one of Canon's wide-angle lenses, known for being lightweight and durable, with excellent image quality. Many professionals actually prefer this lens over the 2.8 version. I own this lens myself, but I rarely use this focal length, so I've decided to sell it. There are some minor scratches, but it's in relatively good condition. The image quality is reportedly superior to the RF 14-35mm. Thank you. Please note that I generally will not respond to price reduction requests.