Editing Binoculars (section)

=== Galilean ===
[[File:Binoculars (AM 2004.5.5-3).jpg|thumb|WW1 era [[Galilean telescope|Galilean]] type binoculars]]
Almost from the invention of the telescope in the 17th century the advantages of mounting two of them side by side for binocular vision seems to have been explored.<ref name="Europa">{{cite web|url=http://www.europa.com/~telscope/binohist.txt |title=Europa.com — The Early History of the Binocular |archiveurl=https://web.archive.org/web/20110613204340/http://www.europa.com/~telscope/binohist.txt |archivedate=2011-06-13 }}</ref> Most early binoculars used [[Galilean telescope|Galilean optics]]; that is, they used a [[convex lens|convex]] [[objective (optics)|objective]] and a [[concave lens|concave]] [[eyepiece|eyepiece lens]]. The Galilean design has the advantage of presenting an [[erect image]] but has a narrow field of view and is not capable of very high magnification. This type of construction is still used in very cheap models and in [[opera glasses]] or theater glasses. The Galilean design is also used in low magnification binocular surgical and jewelers' [[loupe]]s because they can be very short and produce  an upright image without extra or unusual erecting optics, reducing expense and overall weight. They also have large exit pupils, making centering less critical, and the narrow field of view works well in those applications.<ref>{{cite book |author=Mark E. Wilkinson |url=https://books.google.com/books?id=ngGzZe-5PBYC&pg=PA65 |page=65 |title=Essential Optics Review for the Boards |isbn=9780976968917 |publisher=F.E.P. International |date=2006 |access-date=2016-10-10 |archive-date=2016-12-27 |archive-url=https://web.archive.org/web/20161227131105/https://books.google.com/books?id=ngGzZe-5PBYC&pg=PA65 |url-status=live }}</ref> These are typically mounted on an eyeglass frame or custom-fit onto eyeglasses.