Proceedings PaperAchromatic Objectives For Several Wavelength Ranges, Current Possibilities And Future Requirements With Regard To Materials
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The optimum combination of wavelenghts required for achromatism to minimize the residual spectrum of lens systems is only known for the wavelength range between 0.365 and 1.014 μm. For this reason a procedure is discussed which permits the calculation of zero-thickness lens systems whose sum of the squared chromatic longitudinal deviations is a minimum in the spectral range of interest. As a guide to proper materials development the investigations also covered materials whose mechanical or climatic resistance is unsatisfactory.