Canon STM Vs. USM - What's The Difference? (And Which Is Best)
Canon STM vs USM : Which one should you chose ?
Pre Canon Ef-s 18-135 Mm 1:3.5-5.6 Is Usm A 18-135 Mm Is Stm Domácich Nové Predné Objektív Tlak Krúžok Dekoratívne Krúžok štítok zľava < Príslušenstvo & časti / www.ebizu.sk
Video: Comparing Canon's USM and STM Lenses Using the 70D's Dual Pixel AF | PetaPixel