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This Smart Adapter^TM has the following features:

• 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.
• Powered by camera body. No external power source required.
• Wide open button (opposite of depth-of-field preview function) makes manual focusing easy.
• The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo cam ball heads.
• High performance 32-bit processor and efficient switched-mode power supply.

Enhancement on MARK IV vs. MARK III:

• The new design of inner housing in MARK IV has a bigger inner hole. Improving the Tilt shift lens preformance. 
• The inner hole is painted with matt coating. This can further reduce the internal reflection.