Canon Breech-lock MountThe breech-lock mount is an exclusive feature whichassures total interchangeability of all Canon lenses andaccessories. Lens change is effected in one swift motion.Exposure CompensationExposure compensation up to +2EV ispossible for special creative effects.Calibrated in 1/3 EV increments, the dialis released by pressing the lock button.Stop-down SlideA convenient feature which allows youtocheck depth of field and performstopped-downmetering with FL or non-fully coupledclose-up accessories.Exposure CompensationExposure compensation up to +2EV ispossible for special creative effects.Calibrated in 1/3 EV increments, the dialis released by pressing the lock button.