Canon EF 28-105mm f/3.5-4.5 USM

Canon EF 28-105mm f/3.5-4.5 USM is a auto focus prime 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

75 mm long, requires consideration if you want to carry in the camera bag. Weights 375 grams so plan ahead, carry only if really necessary. With a lens filter diameter of 58 mm commonly filter size, gives you a variety of filter options.