Toshiba IK-HD1E Instruction Manual page 19

(d) Changing the automatic shutter zone area
Move the " " to AREA by pushing [MENU UP], [MENU DOWN] buttons.
Select the measurement light area by pushing [DATA UP], [DATA DOWN] buttons.
PRESET A
The available picture area is shown by the shading correction on the screen that is parted in 64.
PRESET A
PRESET E
Note:
These available picture areas are not displayed on the screen.
DATA UP
PRESET B PRESET C
DATA DOWN
PRESET B
PRESET D PRESET E
PRESET C
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PRESET D