NEC PA1705UL-W Installation Manual page 58

2. Projecting an Image (Basic Operation)
Performing Lens Calibration
After mounting the separately available lens unit or
replacing a lens unit, perform [LENS CALIBRATION]
by holding to press ZOOM/L-CALIB. button on the
cabinet over two seconds.
Calibration corrects the adjustable zoom, shift, and
focus range. If calibration is not performed, you may
not be able to get the best focus and zoom even if
you adjust the focus and zoom for the lens.
23