| 摘要 |
The invention relates to a lens 10 comprising two or more seating surfaces 18a to 18d and an optical axis 16 offset from the centre of the lens such that the optical axis is spaced by a first distance from a first seating surface and by a second distance from a second seating surface. The first and second distances are different so that the lens can be orientated to provide at least two different optical axis heights depending upon which seating surface is chosen to seat the lens. The lens can be used to compensate for variations in glue thickness and/or the height of an optical path. |
