To enhance usability, the lens features a one-touch focusing clutch that allows for swift transitions between autofocus and manual focus modes. Its internal focusing design ensures that the lens length remains constant during operation. The medium-torque focusing ring further aids in precise handling, providing refined control for manual focusing. Moreover, the lens is equipped with a nine-blade diaphragm, which enhances the aesthetic quality of out-of-focus areas when utilizing shallow depth of field techniques.

• Compatible with Canon APS-C-format DSLRs, this wide-angle zoom provides a 17.5-32mm equivalent focal length and features a constant f 2.8 maximum aperture for consistent low-light performance throughout the zoom range.
• One P-MO hybrid aspherical element in the front group pairs with two glass-molded aspherical elements in the rear group to minimize distortions and correct aberrations. Additionally, three SD ultra-low dispersion elements are also incorporated within the lens design to further reduce chromatic aberrations for greater color accuracy and clarity.
• Multi-layer lens coatings reduce lens flare and ghosting for greater contrast and maintained color fidelity.
• A one-touch focus clutch mechanism permits seamless switching between autofocus and manual focusing positions, and the focusing ring features a moderate amount of torque for more fine-tuned control over the focusing position.
• An internal focusing mechanism maintains the overall lens form factor during operation.
• A nine-blade diaphragm contributes to a smooth out-of-focus quality, which benefits the use of shallow depth of field techniques.