----------------------------------- nobody 22 Aug 2018 15:05 ----------------------------------- Cautati "Binocular Collimation vs. Conditional Alignment" de acelasi autor (William J. Cook) Citez: Numerous articles depict devices to “tell you if your binocular is collimated.” However, most such tests concern themselves with conditional alignment only and not the 3-axis collimation higher quality binoculars have when they leave the factory. The Internet is a repository of material illustrating how one can collimate a binocular by simply looking at a roofline or power pole while “tweaking” a few collimation screws. As often as not distance to the target—an important issue—is not specified. These authors aren’t trying to mislead; they simply don’t understand there are numerous levels of binocular alignment that depend on a person’s knowledge of the subject as well as their on level of spatial accommodation. After searching libraries and the Internet, I have learned why. The last treatise on 3-axis binocular collimation—available to the general public—was published by G. Dallas Hanna in Amateur Telescope Making III, in 1953, and originated through his association with the California Academy of Sciences while establishing a facility for the US Navy to repair optical instruments used in the Second World War.