Ten years after publication of ""Infrared Optics and Zoom Lenses"", this text is still the only current publication devoted exclusively to infrared zoom lenses. This updated second edition includes 18 new refractive and reflective infrared zoom systems, bringing the total number of infrared zoom optical systems to 41 systems. Other additions include a section for focal plane arrays and a new closing chapter specifically devoted to applications of infrared zoom lenses. The wavelength region has been expanded to include the near infrared. Additional topics include the importance of principal planes, athermalization by means of computer glass substitution, and global optimization of zoom lenses.