Arri-news 2014

HOW IS LENS DATA GENERATED? Lens data generation has two basic requirements: first, the system needs to know where the lens ring is. This information comes from encoders, which are either built into the lens (LDS lenses), located inside lens motors or housed in a separate unit, like the Lens Data Encoder LDE-1. Second, the system needs to have a lens table that converts the raw encoder values into something a human can use, like T-stops and focus ring values. ARRI offers two basic configurations: WCU-4 SOFWARE UPDATE 2.0 ALLOWS EASIER LENS PROGRAMMING Through lens programming, lens tables can be generated for any lens, from vintage anamorphics to modern PL mount zooms, allowing them to be controlled – and lens data to be collected from them – via the Electronic Control System. Software Update Packet (SUP) 2.0 for the WCU-4 makes lens programming easier than ever before. The hand unit now offers an interface for lens programming on its large LCD screen, so a lens scale can be programmed wirelessly in less than a minute, with no additional equipment besides the WCU-4, UMC-4 (or an ALEXA Plus or Studio camera) and lens motors. The resulting lens file is stored on an SD card, which can be taken out and reused elsewhere. Additional features of WCU-4 SUP 2.0 include minor bug fixes and improvements made in direct response to customer feedback. Software updates such as this one permit the Electronic Control System to evolve and adapt, making it future-proof and a sound long-term investment. Option 1: LDS lens and LDS camera Each LDS lens can detect the position of its lens rings and store its own lens table. When mounted to a PL-LDS mount camera, the data is transmitted directly to the camera, which calculates precise lens values, accurate to the frame. ARRI’s controlled lens motors and the Lens Data Encoder LDE-1 deliver raw data about the position of the lens rings to either a UMC-4 or an ALEXA Plus module. These devices incorporate the LDS Lens Data Archive, which provides the relevant lens table used to calculate the lens value. Option 2: External lens encoders and the Lens Data Archive LENS DATA ENCODER LDE-1 The new Lens Data Encoder LDE-1 extends the functionality of the Electronic Control System. Incorporating an encoder that delivers data indicating the position of the lens ring to which it is attached, the LDE-1 can be used in parallel with a manual follow focus unit or a third-party wireless lens control system. It allows lens data to be generated in situations when an ALEXA Plus or Studio (or a UMC-4) is being used without an ARRI lens motor or an LDS lens. Download the system brochure here: www.arri.com/goto/0914/ecs LDS camera LDS lens Non-LDS camera Non-LDS lens Lens data encoder Universal Motor Controller UMC-4 with Lens Data Archive ARRI NEWS 25