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I have four different diagonals, Baader 2” BBHS, Baader 2” Dielectric, Baader T2 Maxbright and Takahashi 1.25” Prism. I checked mine when I bought them and found the only one out of collimation was the Baader Dielectric.
I set up my laser in the focuser of my TMB and placed a translucent black plastic disc with a central pinhole over the objective to make sure the focuser was aligned. I then shimmed the diagonal’s mirror until the laser beam exited the same pinhole. The other diagonals were within a mm of the centre.
The BBHS has push-pull screws for collimation with the mirror attached to the backplate.
Last edited by Rainmaker; 19-05-2020 at 09:08 AM.
Reason: Spelling
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