When the lens is attached for the first time, adjust the back focus of the lens if the focus is not clear when it is zoomed to the telephoto or wide-angle end.
Adjusting the Back Focus
The Siemens Star Chart is most suitable as the subject.
Place an object at approximately 3 m away from the camera recorder.
Open up the iris.
Set the lens to the telephoto end.
Turn the focusing ring to adjust the focus.
Set the lens to the wide-angle end.
Loosen the F.B. locking screw of the lens and turn the back focus adjustment ring to adjust the focus.
Repeat the steps from 3 to 6 to adjust the focus at both ends of the zoom.
After determining the position of the back focus adjustment ring, tighten the F.B. locking screw.
Memo
For details, please refer to the “INSTRUCTIONS” of the lens.
