Canon 20mm f/2.8 USM

Key features include: 

• Focal Length: 20mm

• F-Stop: F2.8 - F22

• Close Focus: 10"

• Filter Thread: 77mm

• Coverage: APSC or Full Frame

• Mount: EF

For optimum visual performance, the Canon EF 20mm f/2.8 USM lens incorporates aspherical elements, to correct spherical aberrations, and Super UD (ultra-low dispersion) elements to eliminate chromatic aberrations.The result is crisp, high-contrast undistorted image quality all the way across the frame. Encorporating a rear floating group and a ring-type ultrasonic motor, the autofocus is driven extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Full-time manual override is also available, making it possible to adjust focus without leaving AF mode.