Canon offers the factory-refurbished Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Camera Lens, model no. 8806A002, for $671.99. Apply coupon codes "20SLR612" and "June612" to cut it to and $537.59 and bag free shipping. That's $241 under the lowest total in-stock price we could find for a new unit. This 1.1-lb. lens is for use with most Canon SLR cameras. A 90-day Canon warranty is included.