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EFCS

EFCS is short for „Electronic First-Curtain Shutter“. It is a hybrid type of shutter that combines the characteristics of electronic and mechanical shutters. Unlike a fully mechanical shutter, where the exposure is both started and ended by the movement of physical curtains, with EFCS, the exposure is initiated electronically directly on the image sensor. The termination of the exposure is then handled by the standard second mechanical curtain. The main advantage of this solution is the reduction of camera vibrations caused by the movement of the first curtain. This phenomenon, known as „shutter shock“, can lead to blurry images, especially when using longer focal lengths and certain exposure times. A disadvantage of EFCS can be the distortion of the blurred background, known as bokeh, when shooting with very fast shutter speeds and fast lenses. Therefore, many cameras automatically switch to a fully mechanical shutter when very fast shutter speeds are set.

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