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class="firstHeading mw-first-heading"><span class="mw-page-title-main">Finderscope</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. 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<div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Finderscope_50.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Finderscope_50.jpg/300px-Finderscope_50.jpg" decoding="async" width="300" height="236" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Finderscope_50.jpg/450px-Finderscope_50.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/99/Finderscope_50.jpg/600px-Finderscope_50.jpg 2x" data-file-width="900" data-file-height="709" /></a><figcaption>A 50mm right-angle finderscope mounted on a 150mm <a href="/wiki/Telescope" title="Telescope">telescope</a>.</figcaption></figure> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Large_Telescope_at_the_Goldendale_WA_Observatory.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Large_Telescope_at_the_Goldendale_WA_Observatory.jpg/300px-Large_Telescope_at_the_Goldendale_WA_Observatory.jpg" decoding="async" width="300" height="214" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Large_Telescope_at_the_Goldendale_WA_Observatory.jpg/450px-Large_Telescope_at_the_Goldendale_WA_Observatory.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Large_Telescope_at_the_Goldendale_WA_Observatory.jpg/600px-Large_Telescope_at_the_Goldendale_WA_Observatory.jpg 2x" data-file-width="2788" data-file-height="1991" /></a><figcaption>Tour guide points out the double Finderscope on the 24.5 inch <a href="/wiki/Cassegrain_reflector" title="Cassegrain reflector">Cassegrain Telescope</a> at the <a href="/wiki/Goldendale_Observatory_State_Park" title="Goldendale Observatory State Park">Goldendale Observatory State Park</a>.</figcaption></figure> <p>A <b>finderscope</b> is an accessory <a href="/wiki/Sight_(device)" title="Sight (device)">sighting device</a> used in <a href="/wiki/Astronomy" title="Astronomy">astronomy</a> and <a href="/wiki/Stargazing" class="mw-redirect" title="Stargazing">stargazing</a>, typically a small auxiliary <a href="/wiki/Refracting_telescope" title="Refracting telescope">refracting telescope</a>/<a href="/wiki/Monocular" title="Monocular">monocular</a> mounted parallelly on a larger astronomical telescope along the same <a href="/wiki/Sightline" class="mw-redirect" title="Sightline">line of sight</a>. The finderscope usually has a much smaller <a href="/wiki/Magnification" title="Magnification">magnification</a> than the main telescope, thus providing a larger <a href="/wiki/Field_of_view" title="Field of view">field of view</a>, useful for manually pointing (a.k.a. "slewing") the main telescope into a roughly correct direction that can easily place a desired astronomical object in view when zooming in. Some finderscopes have sophisticated <a href="/wiki/Reticle" title="Reticle">reticles</a> to more accurately aim the main telescope and/or even perform <a href="/wiki/Stadiametric_rangefinding" title="Stadiametric rangefinding">stadiametric measurements</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Function_and_Design">Function and Design</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Finderscope&action=edit&section=1" title="Edit section: Function and Design"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Finderscopes contain mechanisms to properly align them with the main telescope's line of sight. Accomplishing this alignment varies based on the design of the finderscope and its mount: usually on amateur telescopes it is done by three or six adjustment screws. </p><p>Finderscopes usually come with a designation of the form A×B, where A is the <a href="/wiki/Magnification" title="Magnification">magnification</a> and B is the <a href="/wiki/Aperture" title="Aperture">aperture</a> of the finderscope's <a href="/wiki/Objective_lens" class="mw-redirect" title="Objective lens">objective lens</a> in millimeters; for example, a 6×30 finderscope means a finderscope with a 30 mm objective and a magnification of 6×. This designation is in the same format used by most <a href="/wiki/Binoculars" title="Binoculars">binoculars</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>A 6×30 finderscope is typically considered the minimum useful size for a magnifying finderscope on an amateur telescope. An 8×50 or larger finderscope is preferred, which allows sighting of fainter objects.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>Most finderscopes have one of three viewing orientations: </p> <table class="wikitable"> <tbody><tr> <th>Type </th> <th><a href="/wiki/Eyepiece" title="Eyepiece">Eyepiece</a> mount </th> <th>Image orientation </th></tr> <tr> <td>Standard </td> <td>Straight through </td> <td>Upside down and reversed (i.e. rotated 180 degrees) </td></tr> <tr> <td>Right-angle </td> <td>90 degrees </td> <td>Backwards (mirror-image) </td></tr> <tr> <td>RACI (Right-angle correct-image) </td> <td>90 degrees </td> <td>Correct </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Reflex_Sights">Reflex Sights</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Finderscope&action=edit&section=2" title="Edit section: Reflex Sights"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Telrad_hinten.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Telrad_hinten.jpg/170px-Telrad_hinten.jpg" decoding="async" width="170" height="324" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Telrad_hinten.jpg/255px-Telrad_hinten.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Telrad_hinten.jpg/340px-Telrad_hinten.jpg 2x" data-file-width="538" data-file-height="1024" /></a><figcaption><a href="/wiki/Reflector_sight" title="Reflector sight">Reflex sights</a> such as the Telrad (pictured) are popular alternatives to traditional finderscopes, and are often used in conjunction with them.</figcaption></figure> <p>Another type of finder commonly found on amateur telescopes is known as a <a href="/wiki/Reflector_sight" title="Reflector sight">reflector (reflex) sight</a>. This non-magnifying <a href="/wiki/Sight_(device)" title="Sight (device)">sight</a> (technically not a "scope") uses a type of <a href="/wiki/Beam_splitter" title="Beam splitter">beam splitter</a> to "reflect" a reticle generated by <a href="/wiki/Collimator#Optical_collimators" title="Collimator">collimating optics</a> into the users field of view. The view of the sky seen through the sight is just what can be seen with the naked eye with an illuminated crosshair or dot seeming to float in space at <a href="/wiki/Infinity" title="Infinity">infinity</a>. These crosshairs are generally illuminated by a small LED. Reflector sights are useful for locating bright objects visible to the naked eye such as stars and <a href="/wiki/Planets" class="mw-redirect" title="Planets">planets</a>. Since the sight uses a beam splitter "window", instead of an optical telescope with the ability to <a href="/wiki/Optical_telescope#Light-gathering_power" title="Optical telescope">gather light</a>, objects dimmer than the naked eye limit can not be seen through it. Finding dim objects with a reflector sight is accomplished by using the object's known position relative to brighter objects as a reference and then slewing a known angular distance (or "<a href="/wiki/Star_hopping" title="Star hopping">star hopping</a>") from the bright object to the desired object. Many reflector sights have circles with a given angular dimension in order to facilitate this. Reflector sights are less useful in <a href="/wiki/Light_pollution" title="Light pollution">light polluted</a> areas since the stars used to guide the observer to a dim object may also be invisible.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Finderscope&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/List_of_telescope_parts_and_construction" title="List of telescope parts and construction">List of telescope parts and construction</a></li> <li><a href="/wiki/Viewfinder" title="Viewfinder">Viewfinder</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Finderscope&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140313170729/http://www.meade.com/support/selbinoc.html">"How to Select the Right Binocular"</a>. Meade Instruments Corporation. Archived from <a rel="nofollow" class="external text" href="http://www.meade.com/support/selbinoc.html">the original</a> on 13 March 2014<span class="reference-accessdate">. Retrieved <span class="nowrap">15 November</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=How+to+Select+the+Right+Binocular&rft.pub=Meade+Instruments+Corporation&rft_id=http%3A%2F%2Fwww.meade.com%2Fsupport%2Fselbinoc.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFinderscope" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">"The Backyard Astronomer's Guide", by <a href="/wiki/Terence_Dickinson" title="Terence Dickinson">Terence Dickinson</a> and Alan Dyer.</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">Rod Mollise, The Urban Astronomer's Guide: A Walking Tour of the Cosmos for City Sky Watchers, Springer Science & Business Media - 2006, page 43</span> </li> </ol></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Finderscope&oldid=1228121521">https://en.wikipedia.org/w/index.php?title=Finderscope&oldid=1228121521</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Category</a>: <ul><li><a href="/wiki/Category:Optical_telescopes" title="Category:Optical telescopes">Optical telescopes</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 9 June 2024, at 15:46<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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