{"product_id":"orion-optics-uk-omc-140-de-luxe-optical-tube-assembly","title":"Orion Optics UK OMC140 De-Luxe Tube Assembly","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e140mm (5.5\") Maksutov-Cassegrain Optics\u003c\/li\u003e\n\u003cli\u003e2000mm Focal Length at f\/14\u003c\/li\u003e\n\u003cli\u003eGuaranteed 1\/6 PV Wavefront Hand-Figured Optics\u003c\/li\u003e\n\u003cli\u003eLightweight 3.5kg Carbon Fibre Tube\u003c\/li\u003e\n\u003cli\u003eZero Image Shift Micrometer Focuser\u003c\/li\u003e\n\u003cli\u003eHilux High-Reflectivity Mirror Coatings\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\u003eOrion Optics UK OMC140 De-Luxe Tube Assembly\u003c\/h2\u003e\n\u003cp\u003eThe Orion Optics UK OMC140 De-Luxe delivers high-magnification views from a remarkably compact package, combining a 140mm aperture with a powerful 2000mm focal length. This f\/14 Maksutov-Cassegrain is built around a hand-figured optical system guaranteed to a 1\/6 PV wavefront accuracy, housed in a thermally stable carbon fibre tube that weighs only 3.5kg. With its zero image shift micrometer focuser and high-reflectivity Hilux coatings, the OMC140 is engineered for uncompromising planetary, lunar, and double-star observation and imaging.\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\u003eProfessional-Grade 1\/6 PV Optics: The Orion Optics UK Standard\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the OMC140 is an optical system manufactured to a standard far exceeding mass-produced telescopes. Each mirror set is hand-figured and tested in the UK to achieve a 1\/6 PV (peak-to-valley) wavefront error, ensuring images are limited only by atmospheric seeing, not the telescope. This level of optical precision, combined with Hilux coatings, produces exceptionally high-contrast views, resolving fine details like the Cassini Division in Saturn's rings and subtle banding on Jupiter's disk.\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\u003eCompact f\/14 Design in a 3.5kg Carbon Fibre Tube\u003c\/h3\u003e\n\u003cp\u003eThe OMC140 packs its 2000mm focal length into a tube just 450mm long and weighing a mere 3.5kg. This impressive portability is made possible by the Maksutov-Cassegrain design and a lightweight carbon fibre tube, which also provides superior thermal stability compared to aluminum, minimizing focus shift during temperature changes. The result is an ideal \"grab-and-go\" instrument for high-resolution work that performs exceptionally well on light-to-medium duty equatorial mounts.\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\u003eHigh-Magnification Specialist: A 2000mm Focal Length for Planetary Imaging\u003c\/h3\u003e\n\u003cp\u003eWith its f\/14 focal ratio, the OMC140 is a specialized instrument designed to excel at high magnification. The long 2000mm focal length provides the image scale necessary to capture fine planetary detail with modern CMOS cameras without requiring aggressive Barlow lenses. The \"Zero image shift micrometer\" focuser is critical for this application, moving the secondary mirror to achieve focus without the lateral image movement (mirror flop) that plagues many competing Cassegrain designs. This stability ensures your target remains perfectly centered while making precise focus adjustments.\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\u003eOMC140 vs. Schmidt-Cassegrains: The Maksutov Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile similar in function to a Schmidt-Cassegrain (SCT), the OMC140's Maksutov-Cassegrain design offers distinct advantages for the discerning observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocusing Stability:\u003c\/strong\u003e The OMC140's micrometer-based secondary focusing system eliminates the image shift inherent in the moving-primary-mirror focusers of most SCTs. This is a decisive advantage for high-magnification imaging and visual work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Quality Guarantee:\u003c\/strong\u003e The 1\/6 PV wavefront accuracy is a certified specification, not a typical marketing claim. This ensures a higher level of performance out of the box compared to the lottery of mass-produced optics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmaller Obstruction:\u003c\/strong\u003e The 44mm secondary mirror creates a central obstruction of 31% by diameter, which is modest for this design and contributes to higher image contrast compared to some SCTs with larger obstructions.\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 makes the OMC140 De-Luxe's 1\/6 PV optics special?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1\/6 PV wavefront\u003c\/strong\u003e specification is a guarantee of optical precision. It means the shape of the mirror surface deviates from a perfect parabola by no more than 1\/6th the wavelength of light. This is significantly better than the \"diffraction-limited\" standard (1\/4 PV) of many mass-produced telescopes and results in visibly sharper, higher-contrast images, especially on challenging targets like planets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the f\/14 OMC140 suitable for deep-sky objects like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe OMC140's long 2000mm focal length and f\/14 ratio create a very narrow field of view, making it unsuitable for framing large objects like the Andromeda Galaxy (M31) or the Pleiades (M45). It excels at smaller deep-sky targets that benefit from high magnification, such as planetary nebulae like the Ring Nebula (M57), globular clusters like M13, and details within brighter galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the 3.5kg OMC140?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a tube weight of only \u003cstrong\u003e3.5kg\u003c\/strong\u003e, the OMC140 is very lightweight and places minimal demand on a mount. For visual use, a mount like a Sky-Watcher AZ-GTi or a Celestron Advanced VX would be more than sufficient. For long-exposure astrophotography, a mount in the HEQ5 or CEM26 class would provide excellent stability and tracking accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the \"Zero image shift micrometer\" focusing on the OMC140 work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis system adjusts focus by moving the secondary mirror with a high-precision micrometer mechanism, rather than moving the entire primary mirror as in most SCTs. This design prevents the lateral \"image shift\" or \"mirror flop\" that can move a target off a small sensor chip during critical focusing, making it a superior solution for high-magnification planetary imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch eyepieces with the OMC140?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the OMC140 is designed with a \u003cstrong\u003e31.7mm (1.25-inch) optical back\u003c\/strong\u003e. It is optimized for use with 1.25-inch eyepieces and accessories. This is a deliberate design choice to maintain the compact form factor and is well-suited to the high-magnification planetary and double-star work the telescope is intended for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the OMC140 perform on Jupiter with its 2000mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2000mm focal length\u003c\/strong\u003e gives the OMC140 the native image scale needed to resolve fine details on Jupiter. Combined with the 1\/6 PV optics, you can expect to clearly see features like the Great Red Spot, intricate cloud bands, festoons, and the shadows of the Galilean moons transiting the planet's disk, provided the atmospheric seeing is good.\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\u003e140mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptics Grade\u003c\/td\u003e\n\u003ctd\u003e1\/6 PV Wavefront (De-Luxe Model)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Diameter\u003c\/td\u003e\n\u003ctd\u003e150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Diameter\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocusing Method\u003c\/td\u003e\n\u003ctd\u003eZero image shift micrometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eHilux on both mirrors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Fibre (De-Luxe Model)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e450mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Weight\u003c\/td\u003e\n\u003ctd\u003e3.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Back\u003c\/td\u003e\n\u003ctd\u003e31.7mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Fixing\u003c\/td\u003e\n\u003ctd\u003eStandard Vixen-style Dovetail\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOMC140 De-Luxe Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003eThis product includes the optical tube assembly only. Finders, diagonals, and eyepieces are sold separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/orion-optics-uk-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOrion Optics UK 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Orion Optics UK","offers":[{"title":"Default Title","offer_id":52942378991901,"sku":"OOUK-OMC-140-DE-LUXE-OPTICAL","price":1330.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Orion-Optics-UK-Logo_89eab899-625d-4154-a02c-1eddd17ef7b0.jpg?v=1789607148","url":"https:\/\/davidastro.com\/fr-us\/products\/orion-optics-uk-omc-140-de-luxe-optical-tube-assembly","provider":"David Astro","version":"1.0","type":"link"}