Zeiss Dimension Manuel D'utilisation page 22

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• Set the focus to the respective distance. For this purpose, a red
dot indicating this distance is engraved into the lens barrel.
It is recommended to lock the focus ring with the fixing
screws.
• Observe and assess the image sharpness using a display
or monitor image.
• Loosen the three grub screws of the ring (5) with the included
hex key.