Orion Optics UK Truss Shroud for 24″ Telescopes
- Designed for 24" Truss Tube Telescopes
- Blocks Stray Light to Maximize Contrast
- Breathable Material Prevents Tube Currents
- Flexible Fabric Fits Around Accessories
The Truss Shroud for 24″ telescopes is an essential accessory for optimizing contrast and thermal stability in large, open-tube instruments by blocking stray light and managing internal air currents.
An open truss design offers portability for large apertures but exposes the optical path to stray light and thermal instability. This shroud, made from a black, latex-type material, solves both problems. It creates a dark interior, preventing off-axis light from streetlights, the Moon, or other sources from reaching the focal plane and washing out faint details on planets and deep-sky objects.
Critically, the material is designed to "keep the air flowing." This breathable nature allows heat radiating from the primary mirror to escape rather than becoming trapped, preventing the formation of image-degrading tube currents. The result is a more stable, higher-resolution view, especially during long imaging sessions or nights with subtle temperature changes.
A shroud serves two primary functions. First, it blocks stray light from entering the optical path, which significantly improves image contrast by darkening the sky background. Second, it helps stabilize the air inside the tube, minimizing thermal currents that can degrade image sharpness.
Yes. The shroud is made from a flexible, latex-type material that is designed to be moved and manipulated. You can stretch and position it to fit securely around your focuser, finder brackets, and dovetail plates for a complete light seal.
The material is specifically described as helping to "keep the air flowing." This breathability is crucial for preventing heat from the primary mirror from getting trapped inside the optical tube. By allowing warm air to escape, the shroud minimizes the formation of tube currents, which are a major cause of soft or blurry views.
The provided information does not state whether the material is waterproof. Its main purpose is to block stray light and allow for airflow to manage thermals, not to serve as a rain or heavy dew cover.
By blocking stray light from neighborhood sources, the 24" Truss Shroud will create a darker background sky in your eyepiece. This increases the contrast between the galaxy and the sky, making it easier to see faint, extended details like the spiral arms of M51 and the connecting bridge to its companion galaxy, NGC 5195.
Any shroud can catch some wind. However, the primary benefit of controlling stray light and thermals often outweighs the risk of wind-induced vibration, especially for planetary imaging where contrast is key. On very windy nights, you may need to assess whether the conditions are suitable for high-resolution imaging with or without the shroud.