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1.25' 90 Degree Diagonal Adapter Erecting Image Positive Prism Optic Mirror for Telescope Eyepiece Accessories

Free shipping on orders over $29.99

$21.17

$ 8 .99 $8.99

In Stock
  • Standard 1.25in diameter fits for 1.25in eyepiece and telescope focuser.
  • Designed for refractor and catadioptric telescopes, and not for reflector telescope.
  • Wide 90 degree angle allows you to view correct image from refractor telescope stand and just look down with a comfortable angle.
  • Easy to install and use. Just insert into 1.25in telescope at the silver end,the other end fix 1.25in eyepiece by the screw.
  • The body is constructed of high quality materials, sturdy and not easy to damage.


Specification:
Condition: Brand New
Material: Metal + Plastic
Color: Black + Silver
Interface: 1.25in
Weight: Approx. 110g

Packing List:
1 x Diagonal Mirror


Tina Sheffield
2025-09-02 20:36:43
My scopes came with 45 deg. angle adaptor. Very difficult position to maintain for me. This is perfect. I'm a beginner. With that said, the images are clear to me.
Robert
2025-08-12 14:01:50
This diagonal is not a Correct Image type despite using "prism" in its description. It yields a 'flipped-image', meaning it is reversed, or "flipped", on ONE axis. Left-becomes-right or top-becomes-bottom - but not both. Depending how you view thru the diagonal (over the top or from the side) it will reverse one axis, either horizontal or vertical.A Correct Image diagonal does not reverse anything going thru it. These are currently around $50 and use an actual prism.
Customer
2025-08-11 18:21:50
I like the angle as my troops is a little short for me, it allows me to not have to bend too far over to use my telescope
College Girl
2025-07-06 13:56:32
Good quality & well made.“Operator Error” as wrong item was ordered. Easy return, & seller very helpful.
Larry C.
2025-06-16 10:22:50
I use this diag on my small refractor. Nothing fancy. Works like it's supposed to.
John M.
2025-05-30 17:17:54
What I received was a mirror diagonal, not a prism diagonal
Fishkiller727
2025-05-27 14:14:17
Bought it for a reflective telescope it would not work. Returned it.
T.Karalidi
2025-05-20 09:19:41
Description of product suggests it is a prism diagonal. However, it is a mirror. Also, there was already dust on the mirror the moment I opened it to check it. I guess you get what you pay for.
Robert
2025-01-08 17:10:48
It fitted perfectly to replace the diagonal that came with scope (I had damaged to screw tightener.) The unit is made of metal and more durable than plastic.
Mephiskapheles6
2024-11-25 18:26:06
Good