Canon EF 17-40mm f/4L USM Lens review

                            CANON EF 17-40mm F4L USM LENS

The Canon EF 17-40mm f/4L USM is an ultra wide-angle zoom lens that offers excellent image  quality and a constant maximum f4 aperture. Its compact, lightweight body makes it an
 ideal traveling companion

This Lens was mounted on a Canon 7D that was knocked off a 2ft high coffee table lens was damaged.

Canon EF 17-40mm f/4L USM lens

 

Broken off piece of the sleeve barrel assembly

                                    

Temporary fix with super glue before new part arrived

                       

Two screw removed that hold the circuit board

                                      

Canon 17-40mm: with Circuit board removed

                                                        

Hidden screws under rubber zoom ring