A 100mm spotting scope with a paraxial 30mm finderscope
The light-gathering power and resolution of a spotting scope is determined by the diameter of the objective lens, typically between 50 and 80 mm (2.0 and 3.1 in). The larger the objective, the more massive and expensive the telescope.
Spotting scope eyepieces are usually interchangeable to adapt for different magnifications, or may have variable zoom to give a range of magnifications. Magnifications less than 20× are unusual, as are magnifications more than 60× since the latter can lead to poorer image brightness, a narrow field of view and too much image shaking, even on a tripod. The eyepiece mount layout can be "straight-through" (the eyepiece is on the same axis as the scope body), or "angled" (the eyepiece is at an angle to the scope body—usually 45 degrees).
The high magnification of spotting scopes makes them prone to image disturbance from vibrations, so they are often stabilized with tripods or (less commonly) monopods, which provide a stationary and steady platform. Tripod heads can be used to control any required movements of the scope.
An ornithologist uses a spotting scope at Rossitten Bird Observatory in 1939. This spotting scope has no zoom eyepiece, but three interchangeable eyepieces with different magnifications
A spotter (right) uses a spotting scope to assist a marksman. Spotting scopes are used on target ranges to avoid walking to the target to verify the placement of hits
Biathlon coaches use spotting scopes to verify and optimize competitors shot placement
spotting, scope, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, november, . This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Spotting scope news newspapers books scholar JSTOR November 2007 Learn how and when to remove this message A spotting scope is a compact lightweight portable telescope optimized for detailed observation of distant objects 1 They are used as tripod mounted optical enhancement devices for various outdoor activities such as birdwatching skygazing and other naturalist activities for hunting and target shooting to verify a marksman s shot placements for tactical ranging and surveillance and for any other application that requires higher magnification than ordinary binoculars typically 20 to 60 A 100mm spotting scope with a paraxial 30mm finderscope The light gathering power and resolution of a spotting scope is determined by the diameter of the objective lens typically between 50 and 80 mm 2 0 and 3 1 in The larger the objective the more massive and expensive the telescope The optical assembly has a small refracting objective lens an internal image erecting system and an eyepiece that is usually removable The image erecting system may use relay lenses prisms such as Porro or roof prisms or a catadioptric system of the Schmidt or Maksutov design Spotting scopes may have a ruggedized design a mounting interface for attaching to a tripod and an ergonomically designed and located control knob for focus adjustment Some spotting scopes also have in built reticles for stadiametric rangefinding Spotting scope eyepieces are usually interchangeable to adapt for different magnifications or may have variable zoom to give a range of magnifications Magnifications less than 20 are unusual as are magnifications more than 60 since the latter can lead to poorer image brightness a narrow field of view and too much image shaking even on a tripod The eyepiece mount layout can be straight through the eyepiece is on the same axis as the scope body or angled the eyepiece is at an angle to the scope body usually 45 degrees The high magnification of spotting scopes makes them prone to image disturbance from vibrations so they are often stabilized with tripods or less commonly monopods which provide a stationary and steady platform Tripod heads can be used to control any required movements of the scope Contents 1 Gallery 2 See also 3 References 4 External linksGallery edit nbsp An ornithologist uses a spotting scope at Rossitten Bird Observatory in 1939 This spotting scope has no zoom eyepiece but three interchangeable eyepieces with different magnifications nbsp A spotter right uses a spotting scope to assist a marksman Spotting scopes are used on target ranges to avoid walking to the target to verify the placement of hits nbsp Biathlon coaches use spotting scopes to verify and optimize competitors shot placement nbsp Spotting scope on its tripodSee also editAircraft periscope Milliradian an angular measurement used in reticled scopes intended for precision shooting Digiscoping long range videography using a spotting scope with a digital video recorder mounted to the eyepiece List of telescope typesReferences edit spotting scope noun Merriam Webster Dictionary merriam webster comExternal links edit nbsp Wikimedia Commons has media related to Spotting scopes Birding Scopes Ask a Biologist Advanced Birders Guide Spotting Scopes Retrieved from https en wikipedia org w index php title Spotting scope amp oldid 1181877021, wikipedia, wiki, book, books, library,
