Takahashi 1.25" Diagonal Prism

  • Takahashi 1.25" diagonal allows the use of 1.25" eyepieces
  • Utilizes a high quality prism instead of a mirror
  • Design uses a non-marring compression ring to hold your eyepieces in place
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  • Regular price $147.00

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Takahashi 1.25" Diagonal Prism

The 1.25-Inch Diagonal Prism by Takahashi:


Takahashi's 1.25-Inch star diagonal uses a high quality prism instead of a mirror. This means a lifetime of service where the coatings won't erode. The prism inside the Takahashi star diagonal returns 100-percent internal reflectivity. Its exit and entry surfaces of the prism are multi-coated for minimum light loss. 

To protect the barrels of your good eyepieces, Takahashi has designed its star diagonal with a non-marring molded compression ring to hold the eyepiece in place. The compression ring is tightened by a ribbed thread-on grip around the eyepiece which simply turns to tighten its hold on your precision cargo. 


OPT Product Number: TK-TFP0090



Angle90 degree
Diagonal Barrel Size1.25"
Diagonal TypeStar Diagonal
Free ShippingYes
Warranty5 Year Warranty
Customer Reviews
5.0 Based on 2 Reviews
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Filter Reviews:
Michael H.
United States United States
Takahashi 1-1/4" Prism Diagonal

Very good product. I like the rotating locking mechanism.

Scott B.
United States
Excellent Prism Diagonal

A very sharp and well-built diagonal. The compression ring doesn't work that well with eyepieces with deep undercuts, but for all others I really like the compression ring. Excellent resolution with little scatter and high contrast. A great diagonal for use with slower telescopes.