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
Questions & AnswersAsk a Question
Is it a erect image prism, or not?
Thank you for your question. This prism is not erect image so it is like a standard mirror diagonal.
Hello 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.
Good morning and thanks for asking. I just tried that combination out and you can access the compression ring on the diagonal. Having said that, I did not feel that this was a good combination. The eyepiece was not stable in the diagonal. An eyepiece as l