ZY Productions has posted a video on YouTube explaining how phase detection autofocus (AF) works. Phase detection is only available in SLR cameras, as it requires a dedicated AF sensor and a translucent section of the camera’s mirror, which are both components you will not find in a mirrorless camera. AF is a key camera function in challenging underwater photographic environments.

For those seeking more detail, Photography Life has also posted an in-depth article about phase detection.