Hybrid optics offer a valuable aberration correction tool for the lens designer. However, careful consideration must be given to the calculation of the optical performance during the design process, and to the practical implementation of the elements if the potential benefits are to be realized in practice. Optical performance can be accurately assessed by tracing multiple diffraction orders. It may be particularly important to utilize such a technique if, for example, the image-forming bundles sample a small number of diffractive zones. This situation is examined in detail.