The EF 24–105mm f/4L IS USM and IS II USM version use a ring type ultrasonic motor, whereas the new EF 24-105mm f/3.5-5.6 IS STM uses Canon's STM stepper motor, which is quieter during video usage. The new EF 24-105mm f/3.5-5.6 IS STM weighs slightly less (525 g / 18.52 oz versus 670 g / 23.6 oz) and costs roughly half the price of the EF 24
A versatile zoom optimized for both stills and video, the EF-S 18-135mm f/3.5-5.6 IS USM from Canon is a 28.8-216mm equivalent lens designed for APS-C-format DSLRs. . Incorporating NANO USM technology, this lens is characterized by its combination of a fast, stills-optimized ring-type Ultrasonic Motor and smooth, silent video-optimized stepping motor for all-around focusing performance to Product Description. The Canon EF-S 18-135mm f/3.5-5.6 IS STM Lens is a wide angle zoom lens with an 18-135mm focal range that is equivalent to 29-216mm in the 35mm format. This wide set of focal lengths offers flexibility in shooting everything from expansive landscapes and cramped interiors to group shots, portraits and distant subjects.