Orion Optics UK IDEAL 12L Optical Tube Assembly
- 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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Lancer l'assistant d'imagerieThe 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.
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.
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.
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.
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.
1/6 PV - Professional
1/8 PV - Research
1/10 PV - Ultra
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.
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.
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.
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:
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.
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