Description
Product Overview
The Cosmo Brands telescope diagonal is engineered for astronomers who demand precise light routing and superior image quality. Featuring a .965 inch high‑index prism, the diagonal redirects the light path at a 45‑degree angle, allowing comfortable eyepiece positioning and reducing strain during long sessions. Constructed from anodized aluminum, the housing resists corrosion and provides a lightweight yet sturdy mount. The precision‑machined prism surfaces are coated to minimize light loss, ensuring maximum brightness and contrast for planetary, lunar, and deep‑sky observations. Compatibility spans a wide range of telescopes, from 1.25″ to 2″ focuser sizes, making it a versatile addition to any optical setup.
Usage
Designed for both casual backyard observers and serious field astronomers, this diagonal excels in diverse environments. Whether you are setting up on a portable mount for a dark‑sky site or attaching it to a permanent observatory tube, the diagonal’s quick‑release clamps secure it firmly without the need for tools. Its compact form factor fits easily into travel cases, and the ergonomic design allows for comfortable viewing angles during prolonged sessions. Ideal for planetary detail work, lunar mapping, and deep‑sky imaging, the diagonal enhances clarity across all wavelengths.

Why Choose Us
Cosmo Brands combines decades of optical engineering with rigorous quality control to deliver a product that stands out in the telescope accessory market. Each diagonal undergoes laser alignment testing to guarantee that the prism is set within ±0.01 degrees of the intended angle, reducing image distortion. The anodized finish not only protects against the elements but also provides a sleek, professional appearance. Backed by a limited lifetime warranty, the diagonal reflects our confidence in durability and performance, giving users peace of mind for years of stargazing.
Key Features
- Precision .965 inch high‑index prism for optimal light transmission
- Anodized aluminum housing resists corrosion and reduces weight
- Universal 1.25″ and 2″ focuser compatibility for broad telescope range
- Quick‑release clamps enable tool‑free installation and removal
- Laser‑aligned construction ensures minimal image distortion
FAQ
What telescope sizes are compatible with this diagonal?
The diagonal fits both 1.25″ and 2″ focuser tubes, making it suitable for most amateur and professional telescopes.
Is the prism coated for anti‑reflective properties?
Yes, the prism features a multi‑layer coating that reduces light loss and enhances contrast across the visible spectrum.
Can I use this diagonal for astrophotography?
Absolutely. The precise alignment and high‑quality prism provide a stable platform for attaching cameras and imaging accessories.
How do I install the diagonal on my telescope?
Simply loosen the quick‑release clamps, insert the diagonal into the focuser, and tighten the clamps. No additional tools are required.
What warranty does Cosmo Brands offer?
The diagonal comes with a limited lifetime warranty covering manufacturing defects, reflecting our commitment to long‑term reliability.






GHZHANG Pipe Locator Cable 8pin 3.5M Durable
VINGVO 45° Telescope Diagonal Mirror Optical Glass
QICBIUD Compact Binoculars 12x Ultra Wide Aluminum
Pomya 1.25 Telescope Diagonal Aluminum Prism
Reviews
There are no reviews yet.