Canon CINE-SERVO 50-1000mm T5.0-8.9 EF User Manual - Page 56

5 OPERATION 5-3-2. Manual Iris Operation Close Open Iris Ring Slide the iris operation mode change-over switch to the "M" position. The iris operation is performed by turning the iris ring on the lens body. NOTE The iris operation mode change-over switch must be set to the "M" position before performing manual iris operations. The lens may be damaged if manual iris operations are forcibly performed with the knob at the "A" position. Instant Auto-Iris Switch When the instant auto-iris switch is pressed during manual iris operation, the iris changes to automatic operation mode while the switch is held down. * The automatic iris operation may not be performed depending on the types of cameras. This adjustment can be performed on the information display. Refer to the "Information Display Manual". 5-4. EXTENDER OPERATION The lens is equipped with a built-in 1.5x extender. The focal length of the lens can be extended to 1.5 times by operating the extender. Note, however, that using the extender lowers the T number by an amount equivalent to the change in focal length, depending on the iris compensation setting. Extender Switching Lever Operation The extender is operated by moving the extender switching lever at the rear of the lens. When the extender switching lever is on the 1.5x index side, the state of the lens is equivalent to having a 1.5x extender mounted. Note that moving the extender switching lever to the 1x index side removes the 1.5x extender and returns to lens to the master lens state. E16