Starguider 1.25" 90 degree prism diagonal

⭐ Starguider 90° Prismatic Correct‑Image Star Diagonal – A Superb Upgrade for Your Refractor! ⭐

We are delighted to offer for sale this Starguider 90‑degree prismatic correct‑image star diagonal — a fantastic enhancement for anyone looking to improve comfort, clarity, and ease of use with their refractor telescope.

A star diagonal allows you to observe from a much more comfortable viewing position, sending the image sideways instead of straight through the tube. Many refractors are designed to require a diagonal to reach focus, so this is intentional — not a fault.

Budget telescope kits often include a diagonal that’s, frankly, not the best. This upgraded model uses a precision prism rather than a mirror, meaning less light loss, a brighter image, and the ability to push magnification a little further while still keeping the view crisp.

Because it uses a prism, this diagonal also produces a correct‑image view — the right way up and the right way round. If you were looking at a book through the telescope, you could read it normally without standing on your head. This makes it ideal for terrestrial viewing, removing the need for a separate erecting prism.

The diagonal is built to last, with a solid ABS body, metal nosepiece, and metal eyepiece holder for strength and stability. The nosepiece is filter‑threaded, allowing you to fit a moon filter directly to the diagonal and freely swap eyepieces while still enjoying the filtered view — a genuinely useful feature.

Supplied complete with dust caps and in brand‑new condition.

A high‑quality, correct‑image diagonal that makes your refractor more comfortable, more versatile, and more enjoyable to use.