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
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”...
R797

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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:  ...
R1133

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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...
R1463

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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...
R1463

... more info
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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....
R555

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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....
R555

... more info
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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,...
R454

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