Osram ROADsight 10 Mode D'emploi page 9

ADJUSTING VIEWING ANGLE
ATTENTION! Adjusting the viewing angle can only be done along the vertical
axis, so be sure to position the device correctly on the windshield along the
horizontal axis as close as possible to the windshield's center.
While pulling or pushing the device in the holder, ensure that the camera captures
the image in proportions of 30% sky / 70% road.
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