The Angenieux 11.5-138mm HR was developed from the design of the 10-120mm T2.0. The 10-120mm was Angenieux’s answer to Zeiss’ very popular 10-100mm T2.0. Angenieux upped the ante by going to a 12:1 zoom range design, at the same T stop, and used a much larger focus scale which was much better suited for “production” film work, (episodic televison, music videos, feature films for blow-up to 35mm, etc.), as opposed to the very compressed focus scale on the 10-1 Zeiss zoom.