Category Archives: Camera Lens

WHAT DOES STM MEAN ON A CANON LENS?   Canon 40mm f/2.8 STM When you see a Canon lens with STM in the name, it means that it features Canon’s Stepper Motor technology. Canon introduced this motor design to be a quieter and smoother focus system that allows for near-silent focusing during video recording. When […]

What do the letters USM on your Canon SLR camera lens mean? If you notice your Canon digital SLR camera lens has the letters USM written on the side, it means the lens has a small motor built into the body. Hence, USM is short for Ultra Sonic Motor. What this means is that your […]