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While designing and manufacturing the Spectra-L200 spectrograph I needed to incorporate T thread attachment for various accessories.
There is NO recognised working standard for an astronomical M42 x0.75mm T thread!
I ended up using a Baader T thread spacer as a "master" after having numerous complaints about "your T thread doesn't fit my xxxx"
A real PITA!!!
Last edited by Merlin66; 21-08-2019 at 11:25 AM.
Reason: added info
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