{"product_id":"orion-optics-uk-odk10-optical-tube-assembly","title":"Orion Optics UK ODK10 Optical Tube Assembly","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e250mm (10\") Corrected Dall-Kirkham Optics\u003c\/li\u003e\n\u003cli\u003e1700mm Focal Length at f\/6.8\u003c\/li\u003e\n\u003cli\u003e50mm Fully Corrected Flat Image Circle\u003c\/li\u003e\n\u003cli\u003e3.5μm On-Axis Spot Size\u003c\/li\u003e\n\u003cli\u003eCarbon Fibre Sandwich Tube Construction\u003c\/li\u003e\n\u003cli\u003e3\" Crayford Focuser with 10:1 Reduction\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 ODK10 Optical Tube Assembly\u003c\/h2\u003e\n\u003cp\u003eThe Orion Optics UK ODK10 is an astrograph engineered for the dedicated imager, combining a 250mm primary mirror and a fast f\/6.8 focal ratio to capture deep-sky objects with exceptional detail. Its integrated 3-lens corrector delivers a 50mm flat field, producing spot sizes as small as 3.5μm on-axis and 6.2μm at the edge of the frame. With a generous 213mm of back focus and a thermally inert carbon fibre tube, the ODK10 supports complex imaging trains and maintains stable focus across temperature changes during a long night of 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\u003eODK f\/6.8 Optical Design: 250mm Aperture and 1700mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe heart of the ODK10 is its Corrected Dall-Kirkham optical system. This design uses a 250mm primary mirror to achieve a 1700mm focal length, striking a balance between wide-field deep-sky imaging and high-resolution planetary work. The native f\/6.8 focal ratio is significantly faster than standard Schmidt-Cassegrains, allowing you to collect more light in less time and reduce total exposure duration for faint targets.\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\u003eFull-Frame Imaging: A 50mm Flat Field with 6.2μm Edge Spots\u003c\/h3\u003e\n\u003cp\u003eUnlike conventional reflector designs that suffer from off-axis coma, the ODK10 incorporates a multi-coated 3-lens corrector to produce a natively flat 50mm image circle. This is large enough to accommodate full-frame (35mm) sensors without vignetting or distortion. The optical correction is superb, yielding tight, round stars with a spot size of just 6.2μm at the very edge of the field, ensuring your images are sharp from corner to corner.\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\u003eThermally Stable Engineering: Carbon Fibre Tube and 3 Cooling Fans\u003c\/h3\u003e\n\u003cp\u003eFocus stability is critical for long-exposure astrophotography. The ODK10 addresses this with a carbon fibre sandwich tube that exhibits virtually zero thermal expansion, preventing the focal plane from shifting as ambient temperature drops. Weighing approximately 12kg and measuring only 530mm long, the open-tube design is further enhanced by three controllable fans behind the primary mirror, ensuring rapid thermal acclimation and minimizing tube currents.\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\u003eHeavy-Duty Imaging Train: 3\" Focuser and 213mm of Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe ODK10 is built to carry modern imaging loads. It features a robust 3\" Crayford focuser with a 10:1 fine reduction knob for precise focus adjustments, even with heavy equipment. An exceptionally generous 213mm of back focal distance provides ample room to install complex imaging trains, including off-axis guiders, large filter wheels, and camera rotators, without running out of focus travel.\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\u003eODK10 vs. a 10\" SCT: The Benefits of a Corrected Astrograph\u003c\/h3\u003e\n\u003cp\u003eWhile a 10\" Schmidt-Cassegrain Telescope (SCT) is a capable instrument, the ODK10 offers distinct advantages for the serious imager. The SCT's primary mirror focusing can introduce image shift, a problem eliminated by the ODK10's fixed mirror and external focuser.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNative Speed and Field:\u003c\/strong\u003e The ODK10's native f\/6.8 is faster than a typical f\/10 SCT, reducing exposure times. More importantly, its 50mm corrected flat field is built-in, whereas an SCT requires an additional, expensive reducer\/corrector to achieve a similar result.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management:\u003c\/strong\u003e The ODK10's open tube and three cooling fans allow it to reach thermal equilibrium much faster than a closed-tube SCT, resulting in sharper images sooner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack Focus:\u003c\/strong\u003e With 213mm of back focus, the ODK10 easily accommodates more accessories than most standard SCTs, providing greater flexibility for your imaging setup.\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 camera sensor size is the ODK10 designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Orion Optics UK ODK10 is engineered to fully illuminate a \u003cstrong\u003e50mm image circle\u003c\/strong\u003e. This makes it ideal for cameras with full-frame (36x24mm) sensors and other large-format astronomy cameras, ensuring sharp stars and no vignetting across the entire field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ODK10's carbon fibre tube benefit astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe carbon fibre sandwich tube has a near-zero coefficient of thermal expansion. This is a critical feature for long-exposure imaging, as it prevents the telescope's focus from shifting due to temperature changes throughout the night. This thermal stability means you spend less time refocusing and more time imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 12kg weight of the ODK10 manageable for a mid-range mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. At approximately \u003cstrong\u003e12kg\u003c\/strong\u003e, the ODK10 optical tube is well within the payload capacity of mid-range equatorial mounts, such as those in the Sky-Watcher EQ6-R or Celestron CGX class, especially when used for imaging. Its short \u003cstrong\u003e530mm tube length\u003c\/strong\u003e also results in a lower moment arm, making it easier for the mount to guide accurately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 213mm back focus on the ODK10 allow me to do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe generous \u003cstrong\u003e213mm of back focus\u003c\/strong\u003e provides extensive flexibility for building your imaging train. It allows you to easily incorporate multiple accessories between the focuser and the camera, such as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOff-Axis Guiders (OAGs)\u003c\/li\u003e\n\u003cli\u003eLarge filter wheels (e.g., 7-position 2\" carousels)\u003c\/li\u003e\n\u003cli\u003eAdaptive optics units\u003c\/li\u003e\n\u003cli\u003eCamera rotators\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the ODK10 perform on the Andromeda Galaxy (M31) with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ODK10 is an excellent choice for a target like the Andromeda Galaxy (M31). The \u003cstrong\u003e1700mm focal length\u003c\/strong\u003e provides enough image scale to resolve intricate dust lanes and star-forming regions in the spiral arms, while the \u003cstrong\u003e50mm flat field\u003c\/strong\u003e ensures that the entire galaxy and its satellite companions, M32 and M110, are framed with pinpoint stars from edge to edge on a full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ODK10 for high-resolution imaging of Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While designed as a deep-sky astrograph, the \u003cstrong\u003e250mm aperture\u003c\/strong\u003e of the ODK10 provides significant resolving power for planetary imaging. When paired with a high-quality Barlow lens (e.g., 2x or 3x) and a high-frame-rate planetary camera, the \u003cstrong\u003e1700mm focal length\u003c\/strong\u003e can be effectively increased to resolve fine details like the Great Red Spot, cloud bands, and festoons on Jupiter.\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\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eCorrected Dall-Kirkham (ODK)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Diameter\u003c\/td\u003e\n\u003ctd\u003e250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1700mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrected Field Size\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot Size (On-Axis)\u003c\/td\u003e\n\u003ctd\u003e3.5μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot Size (Field Edge)\u003c\/td\u003e\n\u003ctd\u003e6.2μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e213mm (from rear of mirror cell, ±1mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3\" Crayford with 10:1 reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eMulti-coated 3 lens system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Size\u003c\/td\u003e\n\u003ctd\u003e96mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon fibre sandwich\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e530mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Diameter\u003c\/td\u003e\n\u003ctd\u003e300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Weight\u003c\/td\u003e\n\u003ctd\u003eapprox. 12kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Cell\u003c\/td\u003e\n\u003ctd\u003eHoneycomb CNC machined aluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling System\u003c\/td\u003e\n\u003ctd\u003e3 controllable fans (heaters optional)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAttachment\u003c\/td\u003e\n\u003ctd\u003eCNC machined aluminium dovetail with supports\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\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":52942364967197,"sku":"OOUK-ODK10-OPTICAL-TUBE-ASSEMBLY","price":5952.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/OrionOpticsUK-ODK10-Optical-Tube-Assembly-1_808c12cc-b42b-4e31-ae8d-fe1ed81ca9ac.jpg?v=1789606889","url":"https:\/\/davidastro.com\/fr-us\/products\/orion-optics-uk-odk10-optical-tube-assembly","provider":"David Astro","version":"1.0","type":"link"}