- True electronic integration of aperture diaphragm - let camera automatically choose aperture in P or S exposure modes, or dial in yourself on the camera body in A or M modes.
- Flocking material coating inside the inner hole to reduce the internal reflection.
- High performance 32-bit processor and efficient switched-mode power supply.
- Wide open button (opposite of depth-of-field preview function) makes manual focusing easy.
- The inner hole is painted with flocking material coating. This can further reduce the internal reflection.
CompareD with older model MB_EF-E-BM4, THE new model added a flocking coating inside adapter, reduce inter-reflection