Diagonals

A telescope diagonal uses mirrors or prisms to redirect the beam of light upward usually by 45 or 90 degrees for more convenient viewing with refractor or Cassegrain telescopes.

While many diagonals produce a backwards view, our correct-image diagonals or prism diagonal provide a correctly oriented image, which is practical for terrestrial viewing.




Manufacturer Product Image Item Name Price+
GSO Eyepieces holder for SCT

Eyepieces holder for SCT

Attaches to the rear cell of Schmidt-Cassegrain or Maksutov-Cassegrain telescopes. Presents a 2" barrel that will accept 2" accessories,...
R450

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GSO 45deg erect image diagonal1.25" prism

45deg erect image diagonal1.25" prism

1.25" correct image diagonal; 45 bend; Up/down correct and left/right correct GSO 1-1/4" Erect Image Diagonals are an Amici prism design....
R550

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GSO 90deg erect image diagonal1.25" prism

90deg erect image diagonal1.25" prism

1.25" correct image diagonal; 45 bend; Up/down correct and left/right correct GSO 1-1/4" Erect Image Diagonals are an Amici prism design....
R550

... more info
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Celestron 1.25" STAR DIAGONAL

1.25" STAR DIAGONAL

Fits telescopes with 1.25” focusers or visual backs, 90º viewing angle, best for observing objects overhead. Accepts standard 1.25”...
R790

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GSO 2" Dielectric 99% Diagonal CNC Machined

2" Dielectric 99% Diagonal CNC Machined

The new GSO 2" CNC machined dielectric diagonals offer an excellent mechanical and optical quality, the special feature as follow:  ...
R1123

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GSO 2" mirror star diagonal

2" mirror star diagonal

These low-cost 2" mirror star diagonal  are of a decent mechanical and optical quality at a bargain price. The body is an all metal...
R1450

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GSO 2" SCT Diagonal

2" SCT Diagonal

These low-cost 2" mirror star diagonal  are of a decent mechanical and optical quality at a bargain price. The body is an all metal...
R1450

... more info
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