Wednesday, August 8, 2012

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

                            CANON EF 17-40mm F4 L 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 dropped off a 2ft 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

Circuit board removed
Hidden screws under rubber zoom ring

casing removed

Zoom ring needs to be removed from old casing by taping out the two plastic white tabs,And fitted to
the new casing on the right.

Weight of the Canon EF 17-40mm f4 L with filter

Canon EF 17-40mm f4 L USM Lens with a EW-83H Hood



Canon EF17-40mm F4L USM Instruction Manual

 Canon EOS-1D Mark IV
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Photos By John Torcasio