A dome for a surveillance camera comprises an at least partially transparent spherical portion, a front transition portion, a back transition portion, and lateral transition portions. All transition portions extend to a perimeter plane and a tangent to the spherical portion where it connects to the front transition portion has an angle α relative to a normal to the perimeter plane, as measured in a symmetry plane, and a tangent to the spherical portion where it connects to the back transition portion has an angle β relative to a normal to the perimeter plane, as measured in the same plane and the same direction as the angle α. The angle β is equal to or larger than the angle α.