Orion Optics UK CT14 Optical Tube Assembly
- 350mm (14") Aperture
- 1600mm Focal Length (f/4.6)
- Guaranteed 1/10 PV Wavefront Optics
- Carbon Fibre Sandwich Tube Construction
- 26kg Optical Tube Weight
Simulate the exact field of view of the Orion Optics UK CT14 Optical Tube Assembly with your specific telescope.
Launch Visual Assistant
Simulate the exact field of view of the Orion Optics UK CT14 Optical Tube Assembly with your specific telescope.
Launch Imaging AssistantThe Orion Optics UK CT14 Optical Tube Assembly combines a massive 350mm aperture with a fast 1600mm (f/4.6) focal length, all built around a primary mirror hand-figured to a guaranteed 1/10 PV wavefront accuracy. This instrument is engineered for ultimate imaging stability, featuring a zero-expansion carbon fibre sandwich tube that maintains focus through changing temperatures. Weighing approximately 26kg, the CT14 delivers research-grade optical performance for serious planetary and deep-sky astrophotographers.
The heart of the CT14 is its 350mm Suprax primary mirror, which is not just machine-polished but hand-finished to an exceptional 1/10 PV wavefront standard. This figure represents the peak-to-valley error across the optical surface, and 1/10th wave is the highest grade Orion Optics UK produces. This level of precision, verified by an included Zygo interferometer report, ensures that the maximum amount of light is concentrated into the smallest possible point, yielding incredibly sharp, high-contrast images of planets and tight stellar fields.
Optical precision requires mechanical stability. The CT14's 400mm diameter tube is a sandwich-construction carbon fibre design with virtually zero thermal expansion, ensuring the 1600mm focal length remains constant as temperatures drop. The primary mirror is supported by a CNC machined, 9-point flotation cell that prevents flexure and astigmatism as the 26kg tube moves across the sky.
The CT14 is equipped with a high-quality 2" rack and pinion focuser with reduction gearing for fine focus control, critical for achieving sharp results at f/4.6. A 40mm threaded extension tube is included for reaching focus with a variety of cameras and eyepieces. For locating targets, a straight-through 8x50 achromatic finder scope is fitted to the tube, providing bright, wide-field views to complement the main telescope's narrow, high-magnification field.
Many telescopes are advertised as "diffraction-limited," which corresponds to a 1/4 PV wavefront accuracy. The CT14's 1/10 PV standard is significantly more precise, a difference that becomes obvious when observing planets at high magnification. The improved surface accuracy reduces scattered light and sharpens fine details, rendering more subtle cloud bands on Jupiter and cleaner divisions in Saturn's rings. For the CT14, this research-grade figure isn't an expensive upgrade—it's the baseline.
For a target like Jupiter, the CT14's 1/10 PV wavefront optics minimize light scatter, which directly translates to higher contrast. You will resolve finer, more delicate details in the cloud bands, see more intricate structure within the Great Red Spot, and achieve a sharper overall image compared to a standard 1/4 PV ("diffraction-limited") mirror of the same 350mm aperture.
The CT14 optical tube weighs approximately 26kg, and the rings add another 3kg, for a total of 29kg before adding a camera, guide scope, or other accessories. You will need a high-capacity German equatorial mount with a payload rating of at least 45kg (100 lbs) for stable imaging performance.
Yes. Like all fast Newtonian telescopes, the CT14 will exhibit coma at the edges of the field, especially with larger camera sensors. To achieve sharp, point-like stars across the entire frame, using a high-quality coma corrector designed for f/4.6 systems is essential for astrophotography.
The carbon fibre sandwich construction has a near-zero coefficient of thermal expansion. This means as the ambient temperature drops during an imaging session, the 1430mm tube will not shrink. This keeps the focal plane stable, preventing focus shift and ensuring your images remain sharp throughout the night without constant refocusing.
A large 350mm primary mirror is heavy and can deform under its own weight if not properly supported. The 9-point suspension mirror cell distributes the weight of the mirror evenly across nine optimized points. This prevents gravitational sagging and flexure as the telescope points to different parts of the sky, preserving the mirror's precise 1/10 PV figure and preventing optical aberrations like astigmatism.
Absolutely. The CT14's large 350mm aperture is exceptional for visual deep-sky observing. When paired with a wide-field 2" eyepiece and a quality O-III filter, the Veil Nebula will show stunning, intricate filamentary detail. The fast f/4.6 focal ratio provides a bright image, making it a powerful instrument for hunting down faint nebulae and galaxies.
| Aperture | 350mm |
| Focal Length | 1600mm |
| Focal Ratio | f/4.6 |
| Standard Optics Grade | 1/10 PV wavefront |
| Primary Mirror Glass | Suprax |
| Mirror Coatings | Enhanced Hilux |
| Secondary Mirror Size | 82mm |
| Tube Material | Carbon fibre sandwich |
| Tube Diameter | 400mm |
| Tube Length | 1430mm |
| Tube Weight | 26kg approx. |
| Focuser | 2" focuser with reduction gearing |
| Extension Tubes | 40mm long, screw threaded |
| Finder Scope | 8x50 |
| Spider | Adjustable 4-vane, stainless steel |
| Mirror Cell | CNC machined aluminium, 9 point suspension |
| Secondary Holder | Machined aluminium, rotatable |
| Mounting Rings | CNC machined tube rings, anodised black |
| Weight of Rings | 3kg |
| Boxed Dimensions | Box 1: 172x58x58mm, Box 2: 58x58x34mm |
| Boxed Weight | Box 1: 20kg, Box 2: 14kg |