Star Diagonals
A star diagonal is an accessory that fits between your telescope and eyepiece, bending the light path by 90 degrees to provide a much more comfortable viewing position.
They are commonly used with refractor and Schmidt-Cassegrain telescopes.
Why Use a Star Diagonal?
Without a diagonal, observing objects high overhead can become uncomfortable as you may need to crouch or bend awkwardly behind the telescope.
A star diagonal allows for a far more natural viewing position.
Types of Star Diagonals
Mirror Diagonals
Provide excellent light transmission and are widely used for astronomical observing.
Prism Diagonals
Offer superb optical performance and are often favoured for lunar and planetary observing with certain telescope designs.
Sizes
The most common sizes are:
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1.25"
-
2"
Ensure your telescope and eyepieces are compatible before purchasing.
Our Advice
A quality star diagonal not only improves comfort but can also enhance image quality. It's one of the most worthwhile upgrades for many refractor and Schmidt-Cassegrain telescope owners.
