The edition of the estimates of the lenses for the 2017-2018 biennium contains 2900 prices of lenses produced and marketed from the beginning of the twentieth century and the first years of the millennium. Compared to previous editions, there are several new features: +700 new models + Buying Guide + Guide to the meaning of the general abbreviations and those used by the most famous brands. Quotes are presented in euro in a range with the details of the minimum and maximum value. They are provided for each lens the following data: 1) Model and other useful element identification 2) The focal length of the lens 3) The maximum aperture of the lens iris (indicated with the international number f /) 4) the type of lens mount 5) the estimate. The book is ordered alphabetically by manufacturer name. Each table can be reached with one click directly from the index. The quotations come from a long research of the Italian market offers, European and American. They were collected tens of millions of data that were then processed by a program created on purpose in order to have an overall average estimate. The book, along with the one dedicated to the cameras estimates, remains a valuable aid and a reference point for antique dealers, collectors, amateur photographers and camera retailers vintage or antique. The book is a convenient format that you can carry in your pocket for quick reference.