Takahashi 1.25" Diagonal Prism

Takahashi 1.25" Diagonal Prism
Item # TK-TFP0090
2 Questions(s)

Waiting List

  • Perfect accessory for Schmidt Cassegrain, Maksutov and Refractor telescopes.
  • The Takahashi TFP0090 Star Diagonal uses a high quality prism - not a mirror.
  • Multi-coated entry and exit prism faces for minimum light loss.
  • The Takahashi TFP0090 Star Diagonal has 100% internal reflectivity.
  • Works with all 1.25" focuser and 1.25" eyepieces.
  • The Takahashi TFP0090 Star Diagonal utilizes a unique compression ring that won't mar the eyepiece finish.
  • Weighs 3 ounces.
  • Five Year Manufacturer Warranty.


Takahashi 1.25" Diagonal Prism

Let's talk quality here. The Takahashi 1.25" 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% internal reflectivity and what's more, the exit and entry surfaces of the prism are multi-coated for minimum light loss. Don't settle for less.

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. How many times has a set screw scratched the barrel or become lost in the dark? Not any more. 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. Step up to one of the best!

Takahashi Product Number: TFP0090
Additional Information

Additional Information

Diagonal Type Star Diagonal
Diagonal Size 1.25"
Manufacturer Takahashi
Warranty 5 Year Warranty
Included Items

Included Items

  • Takahashi - 1.25" Star Diagonal Prism
Questions & Answers

Product Questions


I was wondering whether the Takahashi 1.25" diagonal prism is able to be used with a 13mm Ethos eyepiece? Not sure if the compression ring will be able to be accessed with that particular eyepiece in place. Thanks.
Is it a erect image prism, or not?
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