https://www.bhphotovide
Specs:
-EF-Mount Lens/Full-Frame Format
-Aperture Range: f/2.8 to f/22
-Three Glass Molded Aspherical Elements
-Three SD Super-Low Dispersion Elements
-Multi-Layer Lens Coatings
-Silent-Drive Module AF System
-Internal Focus; One-Touch Focus Clutch
-Nine-Blade Diaphragm