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Paraxial analysis of zoom lens composed of three tunable-focus elements with fixed position of image-space focal point and object-image distance.

This work performs a paraxial analysis of three-component zoom lens with a fixed position of image-space focal point and a distance between object and image points, which is composed of three tunable-focus elements. Formulas for the calculation of paraxial parameters of such optical systems are derived and the calculation is presented on examples.