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In the mechanical engineering of optical systems, the preferred position, orientation, and size of the image are determined by the optical designer. It is the mechanical engineer’s responsibility to locate all of the elements in the system with sufficient accuracy to maintain the optical designer’s intentions. To that end, the mechanical engineer must be able to know the influence that each of the optical elements, including the object, has on the position, orientation, and size of the system’s image.
The mathematical functions that relate the motions of the image to the motions of the lens and the motions of its object are called optomechanical influence functions. These functions can be developed using Gauss’ equation and the Gaussian properties of the lens.
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