Canon EF 20-35mm f/3.5-4.5 USM

Canon EF 20-35mm f/3.5-4.5 USM is a auto focus wide angle zoom lens for full frame cameras.

Optical design

Has 5 aperture blades, this number of blades are commonly used. Having rounded blades provides out of focus circle shape closer to a circle. Ultrasonic motor converts ultrasonic vibration energy into rotational force to move the lens. this is the currently the fastest focusing motor in the canon range,

Physical characteristics

With a lens filter diameter of 77 mm this lens deserves a good quality filter, this is commonly filter size, offers a wide range of filter options. Weights 340 grams so plan ahead, carry only if really necessary. 69 mm long, this small lens should be always in the camera bag.