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So either you would find that ring at the bottom of the eyepiece clamp that was attached onto the prism housing before, or someone else had removed a previous clamp and did not notice that this "thread-adapter" got removed as well.
You might contact your dealer - or buy that ring separately: https://www.baader-planetarium.com/en/baader-adapter-m36.4--t-2-(t-2-part-03).html
If you want to dig deeper into this question (which has no final answer), we recommend two PDFs on our website:
Baader Star Diagonals (T-2 and 2") at https://www.baader-planetarium.com/en/downloads/dl/file/id/1617/product/1687/baader_star_diagonals_t_2_and_2.pdf – here we explain the differences between our various star diagonals and coatings
Testreview - Mirror vs. dielectric vs. prism diagonal comparison - W. Paolini at https://www.baader-planetarium.com/en/downloads/dl/file/id/160/product/2871/testreview_mirror_vs_dielectric_vs_prism_diagonal_comparison_w_paolini.pdf – an in-depth test of mirrors and prisms.
We also have Baader T-2 BBHS ® Mirror Diagonal # 2456103 and Baader T-2 Maxbright Mirror Diagonal # 2456100, which can be equipped with the same nose piece and eyepiece clamp. You can find an overview of all our star diagonals in this PDF:
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|Net weight (kg)||0.20|
|Optical Design||Star Diagonal Prism|
|Inner Connection (lens sided)||Thread, T-2 (M42 x 0,75)|
|Outer Connection (lens sided)||Barrel, 1¼"|
|Inner Connection (eyepiece/-camera-sided)||Clamp, 1¼"|
|Outer Connection (eyepiece/-camera-sided)||Thread, T-2 (M42 x 0,75)|
|Reflection surface||Total reflection|
|AR-Coating||High transmission multi-coated (HT-MC)|
|Image Orientation||Erect image, Mirror inverted|
|Optical length (mm)||64|
|Inner Diameter / Clear Aperture (mm)||32|