Telescope Diagonal Mirrors

Diagonal mirrors for telescopes are essential accessories for all refracting and Cassegrain telescopes, redirecting the light beam toward the eyepiece for optimal viewing comfort. They improve ergonomics, prevent uncomfortable viewing positions, and ensure a sharp, clear image.

Available in standard mirror or dielectric mirror models, diagonal prisms offer performance tailored to every application: dielectric mirrors provide higher contrast and optimal light transmission, while standard mirrors remain reliable for everyday visual observation. They are compatible with most eyepieces and can be used on instruments for both visual astronomy and amateur astrophotography. Diagonal prisms are often used in conjunction with eyepieces, focusers, Barlow lenses and focal extenders, as well as other telescope accessories.

At Astronomy Plus, we offer a selection of reliable, durable telescope diagonal mirrors with professional-grade optics, suitable for both beginners and experienced astronomers. Choosing a high-performance diagonal mirror ensures a comfortable, precise, and enjoyable observing experience every time.