Patent ID: 8363322

Claim:
A method of adjusting the pupil delay compensation of a convergent or divergent beam propagating along a propagation axis, the method comprising: providing a device including an afocal system comprising one or more passive optical components disposed along an axis, wherein at least one of the components comprises a focusing diffractive component, placing the afocal system on the propagation axis of the beam, the axis of the afocal system being coaxial with the propagation axis of the beam, and moving the device along the propagation axis of the beam until a required pupil delay compensation is obtained, wherein the delay compensation comprises the algebraic sum of intrinsic pupil delays of each of the one or more passive optical components of the afocal system and is within a range of delay compensation values, where the limits of the range comprise functions of the combination of the one or more passive optical components in the afocal system of the device.