Aputure Follow Focus DEC Lens Regain for MFT, Black (DECLR-MFT) The Aputure DEC LensRegain for MFT adds a focal reducing optical element. That makes it not only a follow focus and adapter, but also a device that gives cropped sensor cameras a full-frame-like view. Aputure DEC LensRegain for MFT allows you to use EF lens on Micro 4/3 or APS-C E-mount camera bodies. It enhances MTF performance and also adds an additional stop of light. The LensRegain has seven layers anti-reflective coatings on each of its 4-group optical elements. It reduces the view of an EF lens to 0.75x and brings more information/light to your cameras sensor. Due to the meticulously crafted quality of this extra optical element, the DEC LensRegain boasts exceptional performance when being judged in relation to MTF, anti-distortion, and anti-dispersion. The 2.4G wireless frequency allows you to wirelessly follow focus, remotely start/stop recording, and adjust aperture.