Single-Lens Translucent

sony slt

A Single-Lens Translucent (SLT) camera is similar to a Digital Single-Lens Relex (DSLR) but uses a beam splitter instead of a solid mirror. Unlike DSLRs SLT cameras do not have an optical viewfinder, instead they rely on an electronic viewfinder, using the image collected by the sensor. A DSLR mirror allows the user to directly view the image that is passing through the lens; in a SLT the mirror is only used for focusing.

A semi-translucent mirror allows the majority of the light to pass through to the sensor while reflecting a portion of the light onto a phase-detection autofocus sensor in the top of the camera, allowing the camera to take photos without any mirror movement (and associated vibrations), as well as full time auto focus. Since the autofocus array is constantly receiving light, SLT cameras are able to use phase-detection autofocus during video recording, while DSLR’s and other interchangeable lens cameras have to use slower contrast detect autofocus for video and live view.

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