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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

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Orion Optics UK IDEAL 12L Optical Tube Assembly

UGC OOUK-IDEAL-12L
Prix d'origine $2,174.19 - Prix d'origine $2,446.82
Prix d'origine
$2,174.19
$2,174.19 - $2,446.82
Prix actuel $2,174.19
Égalisation de prix!
  • 300mm (12") Primary Mirror Diameter
  • 1600mm Focal Length (f/5.3)
  • 1/6 PV Wavefront Standard Optical Accuracy
  • Eris 2" Rack and Pinion Focuser
  • 16kg Nominal Tube Weight
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty
  • IDEAL 12L Optical Tube Assembly

    The Orion Optics UK IDEAL 12L combines a large 300mm aperture with a versatile 1600mm focal length (f/5.3) in an optical tube weighing a manageable 16kg. Every IDEAL 12L is built around a primary mirror hand-figured to a minimum 1/6 PV wavefront accuracy, with each optic's quality certified by an included Zygo interferometer report. This OTA is engineered for observers and imagers seeking high-contrast, diffraction-limited views without the cost of research-grade instruments.

    300mm f/5.3 Primary with 1/6 PV Wavefront Accuracy

    The heart of the IDEAL 12L is its 300mm primary mirror. This large aperture gathers significant light, resolving faint details in distant galaxies and nebulae. The 1600mm focal length strikes a balance, providing enough image scale for detailed views of planets and the Moon while the f/5.3 focal ratio remains fast enough for deep-sky imaging.

    Orion Optics UK guarantees a standard optical quality of 1/6 PV wavefront. This figure, verified by Zygo laser interferometry for every mirror, ensures that the telescope delivers sharp, high-contrast images capable of revealing fine planetary detail like Jupiter's cloud bands and the Cassini Division in Saturn's rings, well beyond what standard "diffraction-limited" optics can resolve.

    CNC 9-Point Cell and Eris 2" Focuser: A Stable Optical Platform

    To maintain the primary mirror's precise figure, the IDEAL 12L uses a CNC-machined 9-point suspension cell. This design evenly supports the 16kg mirror, preventing flexure and astigmatism as the telescope moves across the sky. A built-in 12-volt fan accelerates mirror cooling, reducing tube currents and ensuring stable images sooner.

    The OTA is fitted with a robust, in-house designed Eris 2" rack and pinion focuser. Its smooth-lock mechanism securely holds heavy eyepieces and imaging cameras without shifting the optical axis, ensuring consistent focus and sharp stars across the field. The entire assembly is housed in a 1510mm long rolled aluminium tube, providing a rigid yet lightweight structure.

    Choosing Your Optical Grade: 1/6 PV vs. 1/8 PV vs. 1/10 PV

    While the standard 1/6 PV optic delivers exceptional views, the IDEAL 12L offers optional upgrades for the most demanding applications. The choice depends entirely on your observing priorities and conditions. A higher-grade mirror doesn't gather more light, but it focuses the light it gathers more precisely, leading to visibly higher contrast on low-contrast planetary features and tighter star images.

    • 1/6 PV (Professional Grade): The standard offering. An excellent all-around choice that provides a significant step up from mass-produced optics, ideal for both deep-sky viewing and serious planetary observation.
    • 1/8 PV (Research Grade): A premium upgrade for dedicated planetary imagers and visual observers. This level of correction can reveal subtle, low-contrast details on Mars and Jupiter that may be lost in a 1/6 PV system under steady seeing.
    • 1/10 PV (Ultra Grade): The highest precision available. This grade is for those who require the absolute best possible image contrast and resolution, typically for specialized research or imaging from sites with consistently excellent atmospheric seeing.

    The images below illustrate the typical improvement in planetary detail as the mirror's surface accuracy increases from the included 1/6 PV Professional grade to the 1/10 PV Ultra grade.

    Saturn view with 1/6 PV optics

    1/6 PV - Professional

    Saturn view with 1/8 PV optics

    1/8 PV - Research

    Saturn view with 1/10 PV optics

    1/10 PV - Ultra

  • What kind of mount is required for the 16kg IDEAL 12L OTA?

    With a nominal weight of 16kg and a length of 1510mm, the IDEAL 12L requires a substantial German Equatorial Mount. For visual use, a mount in the EQ6/CGEM class is the minimum. For serious astrophotography, a mount with a higher payload capacity, such as a Sky-Watcher EQ8-R or similar, is strongly recommended to handle the weight and long moment arm.

    How will the IDEAL 12L perform on faint galaxies like the Leo Trio (M66 Group)?

    The 300mm aperture is excellent for resolving details in galaxy groups. With the IDEAL 12L, you can expect to clearly see the distinct shapes of M65, M66, and NGC 3628 in the Leo Trio from a dark sky site. The f/5.3 focal ratio provides a wide enough field with a 2" eyepiece to frame multiple galaxies, while the high-contrast optics will help reveal dust lanes and spiral structure.

    Is the standard 1/6 PV optic on the IDEAL 12L good enough for high-resolution imaging of Jupiter?

    Absolutely. The 1/6 PV wavefront standard is significantly better than typical mass-produced optics and is more than capable of producing detailed, high-contrast images of Jupiter. It will clearly resolve major features like the Great Red Spot, prominent cloud bands, and festoons, especially when paired with a high-frame-rate planetary camera and good seeing conditions.

    Why should I consider upgrading the IDEAL 12L to 1/8 PV or 1/10 PV optics?

    Upgrading to 1/8 PV or 1/10 PV is for observers who want to extract the maximum possible detail from the 300mm aperture. This upgrade is most beneficial for:

    • Planetary Imaging: Higher precision optics yield higher contrast, making it easier to capture subtle atmospheric details on Jupiter, surface features on Mars, or Encke's division in Saturn's rings.
    • Visual Observing from excellent sites: If you regularly observe under very steady skies (good "seeing"), the higher optical grade will allow you to push magnification higher without the image breaking down.

    What is the purpose of the 9-point mirror cell in the IDEAL 12L?

    The CNC 9-point suspension mirror cell provides optimized support for the 300mm primary mirror. A large mirror can sag under its own weight, distorting its carefully figured shape and degrading the image. The 9-point cell distributes the support across the back of the mirror, neutralizing the effects of gravity and preserving the optical alignment and performance as the telescope points to different parts of the sky.

    Does the IDEAL 12L require collimation?

    Yes, like all Newtonian telescopes, the IDEAL 12L will require periodic collimation to ensure the primary and secondary mirrors are perfectly aligned. The robust mirror cell and tube construction help it hold collimation well, but checking alignment before each session with a laser collimator or Cheshire eyepiece is recommended for optimal performance.

  • Primary Mirror Diameter 300mm
    Focal Length 1600mm
    Focal Ratio f/5.3
    Standard Optical Grade 1/6 PV wavefront
    Optical Upgrade Options 1/8 PV and 1/10 PV
    Secondary Mirror Size 63mm
    Focuser Eris 2" Rack and Pinion with smooth lock
    Mirror Cell CNC 9-point suspension
    Mirror Cooling 12-volt fan
    Tube Material Aluminium
    Tube Diameter 326mm
    Tube Length 1510mm
    Tube Weight 16kg (nominal)
    Tube Finish Galaxy Silver Paint
    • IDEAL 12L Optical Tube Assembly Only

  • Orion Optics UK 1-Year Warranty