{"product_id":"explore-scientific-01-14250","title":"Explore Scientific BT-120mm ED Giant Binocular","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTwin 120mm ED Apochromatic Objectives\u003c\/li\u003e\n\u003cli\u003eInterchangeable 1.25\" Eyepiece Holders\u003c\/li\u003e\n\u003cli\u003eIncludes Starter Eyepiece Pair\u003c\/li\u003e\n\u003cli\u003eReduces Eye Strain for Long Sessions\u003c\/li\u003e\n\u003cli\u003eRequires a Substantial U-Fork or Centerline Mount\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific BT-120mm ED Giant Binocular\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific BT-120mm ED Giant Binocular uses twin 120mm objective lenses with Extra-Low Dispersion (ED) glass to produce an immersive, two-eyed view of the cosmos free of false color. Its individual helical focusers and interchangeable eyepiece holders accept standard 1.25-inch astronomical eyepieces, allowing you to tailor magnification for sweeping views of the Milky Way or detailed observations of planetary surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTwin 120mm ED Objectives: Apochromatic Views of the Deep Sky\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the BT-120mm ED are two massive 120mm air-spaced triplet objectives. This immense aperture gathers significant light, resolving faint details in distant galaxies and revealing the delicate structures within nebulae like the Veil Nebula (NGC 6960). The use of premium ED glass virtually eliminates chromatic aberration, the false color fringing seen around bright objects in simpler designs.\u003c\/p\u003e\n\u003cp\u003eThis apochromatic correction ensures stars resolve as sharp points against a black background, and high-contrast targets like Jupiter's cloud bands and the lunar terminator are rendered with impressive clarity and true-to-life color. The result is a clean, high-contrast image that holds up even at higher magnifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e1.25\" Eyepiece Compatibility: Tailor Your Magnification\u003c\/h3\u003e\n\u003cp\u003eUnlike fixed-magnification binoculars, the BT-120mm ED accepts interchangeable 1.25-inch eyepieces, giving you complete control over your field of view and magnification. This system allows you to adapt the instrument to any target, from wide-field sweeps to high-power planetary observation. The binocular includes a pair of starter eyepieces to get you observing immediately.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Power Viewing:\u003c\/strong\u003e Use long focal length eyepieces to frame large objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Power Viewing:\u003c\/strong\u003e Switch to shorter focal length eyepieces to increase magnification for splitting tight double stars like Albireo (Beta Cygni) or resolving globular clusters like the Hercules Cluster (M13).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting the BT-120mm ED: A Requirement for Stability\u003c\/h3\u003e\n\u003cp\u003eDue to its considerable size and weight, the BT-120mm ED is designed exclusively for mounted use. A stable platform is not just recommended; it is essential to realizing the optical potential of this instrument. Hand-holding is not a viable option.\u003c\/p\u003e\n\u003cp\u003eThese binoculars are optimized for use with a robust fork mount, such as the Explore Scientific U-Mount with tripod, which provides the necessary stability and allows for smooth, intuitive pointing across the sky. Please note that a mount and tripod are not included with the binoculars and must be purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBT-120mm ED vs. a Single 120mm Refractor: The Two-Eyed Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile a single 120mm apochromatic refractor offers excellent views, the binocular configuration of the BT-120mm ED provides a distinctly different and often more engaging observing experience.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle Telescope Advantage:\u003c\/strong\u003e A traditional 120mm refractor is typically lighter, requires a less specialized mount, and is more easily adapted for astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBT-120mm ED Advantage:\u003c\/strong\u003e Observing with both eyes significantly reduces eye strain and fatigue during long sessions. More importantly, the brain's ability to process information from two eyes enhances perceived contrast and detail, often making faint objects appear more distinct and giving a subtle 3D-like quality to star clusters and nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Explore Scientific BT-120mm ED binoculars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need a very stable, high-capacity mount specifically designed for giant binoculars. The Explore Scientific U-Mount on a heavy-duty tripod is the recommended solution. Standard photographic tripods or light-duty telescope mounts will not provide adequate support for the BT-120mm ED's size and weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my existing 1.25\" telescope eyepieces with the BT-120mm ED?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The BT-120mm ED features standard 1.25-inch eyepiece holders with individual helical focusers. You can use any pair of matching 1.25\" astronomical eyepieces to change the magnification and field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the view through the BT-120mm ED compare to a large single telescope like a 10\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 10-inch Dobsonian has significantly more light-gathering power and will show fainter objects. However, the \u003cstrong\u003eBT-120mm ED\u003c\/strong\u003e provides a wide-field, two-eyed perspective that many observers find more comfortable and immersive for sweeping through the Milky Way or observing large star clusters and nebulae. The two-eyed view can also enhance perceived contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of ED glass in these 120mm binoculars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eExtra-Low Dispersion (ED) glass\u003c\/strong\u003e corrects for chromatic aberration, which is false color fringing (typically purple or blue halos) around bright objects. This results in sharper, higher-contrast images with more accurate color, especially noticeable when observing the Moon, planets like Jupiter, and bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Orion Nebula (M42) look through the BT-120mm ED with low-power eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its large 120mm aperture and a pair of low-power, wide-field eyepieces, the BT-120mm ED will frame the Orion Nebula (M42) beautifully. You can expect to see the bright Trapezium star cluster resolved at the core, surrounded by the sweeping arcs of nebulosity, all with the comfortable and immersive feel of a two-eyed view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the BT-120mm ED binoculars suitable for viewing Jupiter's moons and cloud bands?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. When paired with higher-magnification eyepieces, the apochromatic 120mm objectives have the resolving power to clearly show Jupiter's four Galilean moons. You will also be able to discern the primary cloud bands, such as the North and South Equatorial Belts, and potentially the Great Red Spot, depending on atmospheric conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e120mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eBinocular Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eExtra-Low Dispersion (ED)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Format\u003c\/td\u003e\n\u003ctd\u003e1.25\" (Interchangeable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803036932\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52909232259357,"sku":"ES-01-14250","price":7770.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-BT-120mm-ED-Giant-Binocular-1_e7e3c6e0-10f5-4cb6-b294-824a5d327a29.jpg?v=1789060824","url":"https:\/\/davidastro.com\/fr\/products\/explore-scientific-01-14250","provider":"David Astro","version":"1.0","type":"link"}