Televue 90 Degree Star Diagonal - 1.25 (Older Style) (OPEN BOX)

The Tele Vue 90 Degree Star Diagonal is a valuable accessory for astronomical observing, designed to provide comfortable viewing angles when using a telescope. Here are the key details about the Tele Vue 90 Degree Star Diagonal with a 1.25-inch barrel:

1. Type: The Tele Vue 90 Degree Star Diagonal is a mirror star diagonal. It uses mirrors to reflect light at a 90-degree angle, allowing observers to comfortably view celestial objects without having to contort their necks or bodies.

2. Barrel Size: It accepts 1.25-inch eyepieces and accessories. This is the standard size for most modern telescopes and eyepieces, ensuring compatibility with a wide range of equipment.

3. Optical Quality: Tele Vue is renowned for its high-quality optics, and their star diagonals are no exception. The diagonal is designed to minimize light scatter and maintain high contrast, preserving the quality of the image observed through the telescope.

4. Build and Design: The diagonal is well-built with precision components, ensuring durability and reliability. It typically features non-marring brass clamp rings to securely hold eyepieces in place without damaging them.

5. Prism Type: The 90-degree star diagonal uses mirrors (prisms) rather than lenses. This design avoids introducing additional chromatic aberrations or distortions to the image, maintaining optical clarity.

6. Comfortable Viewing: The 90-degree angle provided by the diagonal allows for more comfortable viewing, especially when observing objects high in the sky. It's particularly useful for prolonged observing sessions where comfort and ease of use are important.

7. Usage: The star diagonal is essential for terrestrial observing (like bird watching) and astronomical observing, allowing for correct orientation of the image (right-side up and left-right correct) when using refractor and Cassegrain telescopes.