The Fujion ECU-3 is an extender module servo/ratio converter for RM and RD model video lenses. For instant close-up shots, the extender inserts an element that doubles the focal length at any point in the zoom range. Instead of using the zoom function, the extender gives immediate close-up images.
Achieving 4:3 aspect ratios from a 16:9 CCD is usually performed by cutting off the sides of the imager, effectively making the minimum focal length at greater telephoto. Fujinon's ratio converter preserves the same picture angles by shortening the original focal length. Shots in standard 4:3 hold the same image size as those shot in 16:9.