{"product_id":"used-orion-premium-linear-binoviewers-2-pairs-of-eyepieces","title":"Used Orion Premium Linear BinoViewers + 2 pairs of eyepieces","description":"\u003cp\u003e\u003cspan\u003eThese are a pair of Orion Premium Linear BinoViewers.  These are the same as the Explore Scientific model BinoViewers (ES-BINOV), as well as those branded Long Perng.   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThese are in \u003cstrong\u003eEXCELLENT\u003c\/strong\u003e condition, in a foam-lined metal hard case, completely clean and unmarked.  \u003c\/span\u003e\u003cspan\u003eThis includes 2 pairs of eyepieces, Orion's 14.5mm Edge-On Planetary eyepieces, and Orion's 27mm EF eyepieces, which are also clean and unmarked.  All of the dust caps are included for both the binoviewers and all of the eyepieces.  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eThis comes in a metal-sided foam-lined case, with pick and pluck foam.  Orion's bankrupt, so you can't even get these anymore! W\u003c\/span\u003e\u003cspan\u003ee can ship these to you.  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    \u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"product info short_description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute short_description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eErect-image 1.25” binoviewer for both terrestrial and astronomical observations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cem\u003eZero optical path length\u003c\/em\u003e means no additional back focus requirements or focuser in-travel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNo Barlow lens or glass path corrector required with any telescope type\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eLinear housing for easy adjustment to a range of interpupiliary distances\u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003cli\u003eWorks with Newts, refractors, SCTs, and Maks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product info description\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch5\u003e\u003cspan\u003eFeatures\u003c\/span\u003e\u003c\/h5\u003e\n\u003cp\u003e\u003cspan\u003eThe night sky with one eye closed is missing a lot. Open both eyes and see the dramatic improvement in resolution, contrast, and viewing comfort.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe BinoViewer is a 1.25-inch device that uses two matching eyepieces\u003cspan\u003e \u003c\/span\u003e\u003cem\u003e(eyepieces not included)\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eto give you AWESOME two-eyed views through your telescope. Because our minds are designed to see the world with both eyes open, when you gaze through a telescope with both eyes, the view is much better.\u003c\/p\u003e\n\u003cp\u003eThe Linear BinoViewers features sliding inter-pupillary-distance adjustment, twist locks to keep your eyepieces safely installed, and a diopter adjustment for one eye. Because it's parfocal, you can use a single wide-view eyepiece to center on your target, then switch to the BinoViewer to enjoy an awe-inspiring view. The BinoViewer has been tested on a number of refractors, reflectors and SCTs and worked on them all.\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"product info short_description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute short_description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product info description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cp\u003eBased on an innovative optical design, Linear Binoviewers deliver superior optical performance and a comfortable viewing experience. Unlike other binoviewers, they are parfocal and add no extra optical path length, which means no extra focuser ‘in travel’ is needed when using them in your telescope. They work with virtually any telescope type, even Newtonians and fast refractors that often have restricted back focus capabilities. Plus, you don't need a Barlow lens or glass path corrector, which means you can enjoy low-power and relatively wide-field binoviewing with 1.25” eyepieces.\u003c\/p\u003e\n\u003cp\u003eNearly all commercial binoviewers use prisms to split the light path in two, but these binoviewers use a knife-edge beam-splitting mirror with a \u0026gt;99% reflective dielectric coating to reduce aberrations and field curvature and improve contrast compared to traditional binoviewers. The device also uses seven lenses in five groups in each optical path which introduces minimal false color and preserves image sharpness. This design also helps ensure matched images for each eye to minimize eye strain while observing.\u003c\/p\u003e\n\u003cp\u003eRather than a “folding” housing typical of most binos, the Long Perng binoviewer features a sliding “linear” housing to let you easily match the eyepiece spacing to an interpupillary distance (IPD) between 58mm and 74mm. This design makes it less prone to miscollimation while adjusting the IPD. The housing also uses an engraved scale to help you repeatably set it to the right IPD position.\u003c\/p\u003e\n\u003cp\u003eThis binoviewer also includes 1.25” eyepiece holders (eyepieces not included) that are self-centering with twist-tightened collars. The right eyepiece holder has a helical diopter adjustment to help ensure both eyepieces come to focus.\u003c\/p\u003e\n\u003cp\u003eThe CNC-machined anodized housing is designed to make it easy to handle without slipping, even if you're wearing gloves. While compact in size with dimensions of 127mm x 105mm x 50mm, the device packs some heft and weighs in at about 1.57 lbs (716g) without eyepieces, so users must use diagonals and focusers that can support it. The 1.25” barrel of the binoviewer is threaded for M28.6x0.6 filters.  The barrel also includes a taper to reduce the chance of the binoviewer slipping from the diagonal or focuser.\u003c\/p\u003e\n\u003cp\u003eThese binoviewers work with nearly any pair of matched 1.25” eyepieces. However, the field stop of these binoviewers is about 17mm, smaller than the 22mm of many traditional small binoviewers. That means wide-field eyepieces with a field stop greater than about 17mm will experience some vignetting.  As a rule of thumb, vignetting occurs in eyepieces for which the focal length multiplied by the apparent field of view (AFOV) is greater than 1,000. For example, a pair of 20mm Plossl eyepieces with a 50-degree AFOV will work fine with these binoviewers (50x20=1000). But a pair of 24mm eyepieces with a 68-degree AFOV (24x68=1632) will experience substantial vignetting.\u003c\/p\u003e\n\u003cp\u003eWhile these binoviewers do not need a Barlow or glass path corrector, they can be used with Barlows or Powermates for high-magnification observations. The manufacturer suggests a pair of medium focal-length eyepieces and a Barlow will deliver a better viewing experience than very short focal length eyepieces without a Barlow.\u003c\/p\u003e\n\u003cp\u003eWhen used 'straight though' with any telescope without a diagonal, these binoviewers deliver an erect image, an ideal feature for terrestrial observations.\u003c\/p\u003e\n\u003cp\u003eWhen used in a refractor, an SCT, or a Mak with a star diagonal or many types of 'correct image' diagonals, the binoviewers delivers an inverted image which is not a problem for astronomical viewing. For terrestrial viewing where image orientation is critical, the binoviewer must be used with an erecting pentaprism diagonal to render an erect image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv class=\"product info description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cp\u003eOrion 1.25\" 90-deg pentaprism diagonal for use with Orion Premium Linear 1.25\" Erect Image Binoviewer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIdeal for use with Orion Premium Linear 1.25\" Erect Image Binoviewer to provide a \"correct\" image (upright and correct from left to right, i.e., a correct, non-inverted, non-reversed image); especially useful for terrestrial viewing.\u003c\/li\u003e\n\u003cli\u003eUses a high quality, dielectric multicoated, BK-7 glass pentaprism to change the viewing angle by 90-deg.\u003c\/li\u003e\n\u003cli\u003e1.25\" eyepiece holder features a non-marring brass-compression ring.\u003c\/li\u003e\n\u003cli\u003e1.25\" nosepiece is threaded to accept standard 1.25\" astronomy filters and features a safety groove.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional Information:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhen used by itself with a refractor or catadioptric telescope and eyepiece, this diagonal provides an image that is inverted (upside down) from top to bottom but correct (not reveresed) from left to right.\u003c\/li\u003e\n\u003cli\u003eNot for use with Newtonian\/Dobsonian reflectors.\u003c\/li\u003e\n\u003cli\u003eIf used with other binoviewers, it will present an image that is oriented differently (i.e., not a correct image) than when used with the Orion Premium Linear binoviewer. That is becuase the Orion Premium Linear binoviewer incorporates an image-erecting lens assembly that other binoviewers do not have.\u003c\/li\u003e\n\u003cli\u003e1.25\" eyepiece holder and nosepiece cannot be unscrewed from the diagonal body.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eViewing Angle: 90°\u003c\/li\u003e\n\u003cli\u003eOptical path length: 120mm\u003c\/li\u003e\n\u003cli\u003eClear aperture: 17mm\u003c\/li\u003e\n\u003cli\u003eMaterials: BK7\u003c\/li\u003e\n\u003cli\u003eCoating: Multi-Coated\u003c\/li\u003e\n\u003cli\u003eHousing material \u0026amp; finish: Aluminum \u0026amp; Anodizing\u003c\/li\u003e\n\u003cli\u003eWeight: 8.6oz (244g)\u003c\/li\u003e\n\u003cli\u003eIncludes 1 end cap and 1 dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product info ca_extra_info\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e","brand":"Orion","offers":[{"title":"Default Title","offer_id":49538942271747,"sku":"U2608-ES-OPLB","price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/CBC019D0-478B-4B6A-8861-3AE729B544CC.jpg?v=1787959151","url":"https:\/\/milehighastro.com\/products\/used-orion-premium-linear-binoviewers-2-pairs-of-eyepieces","provider":"Mile High Astronomy","version":"1.0","type":"link"}