Sigma EX 17-35mm F/2.8-4.0 Lens for Sigma SA Sony NEX

Will Trade for comparable Nikon... Canon...Sony A mount lens
UP FOR SALE IS Sigma EX 17-35mm (WIDE ANGLE) F/2.8-4.0 Aspherical HSM Lens for Sigma SA mount.
The lens has no signs of use....like new...with lens bag, hood and front and end caps. I also have Hoya filter 30 and Tiffen circular polarizer 45 for this lens..sold separately. This lens is for SIGMA cameras but will work on Sony NEX with adapter
http://www.amazon.com/Sigma-Lens-Adapter-Mounts-Camera/dp/B00CWXJVEE