Strange issue with Quark T Thread adaptor
Posted: Tue Aug 23, 2016 6:22 pm
Hello,
together with my Quark, I ordered a Quark T-Thread adaptor. When I wanted to use it a few days ago, it did not fit as it should. Unscrewed the eyepiece holder then putting on the T-thread adpaptor I could screw it 1/4 to 1/2 turn, and then it is completely stuck. On another forum i found the thread should be something like 1.375" x 24, which is 3,49cm x 27 TPI. TPI i can't measure so i measured the outside diamer of the thread on the adaptor: 3,49 cm. That looked ok (seems to be the same a the old celestron visual back, so tried it on the old C8 tele-extender, perfect match)
Then i measured the Quark eyepiece holder: 3,45 cm. So a difference of 4 mm. This makes that the adaptor does not fit in the thread on the Quark (measured the same on the female thread in the Quark)
I called my supplier and he did some tests with the same type of adaptor on his quark. Fits perfect. He measured the outside diameter of the adaptor: 3,49 cm. Exactly the same as mine.
So we both are confused. (we do some more tests next week) If anyone had similar problem, or could measure the diameter of the thread on their quarks with a slide caliper I would very much like to know the results.
Kind regards,
Paul
together with my Quark, I ordered a Quark T-Thread adaptor. When I wanted to use it a few days ago, it did not fit as it should. Unscrewed the eyepiece holder then putting on the T-thread adpaptor I could screw it 1/4 to 1/2 turn, and then it is completely stuck. On another forum i found the thread should be something like 1.375" x 24, which is 3,49cm x 27 TPI. TPI i can't measure so i measured the outside diamer of the thread on the adaptor: 3,49 cm. That looked ok (seems to be the same a the old celestron visual back, so tried it on the old C8 tele-extender, perfect match)
Then i measured the Quark eyepiece holder: 3,45 cm. So a difference of 4 mm. This makes that the adaptor does not fit in the thread on the Quark (measured the same on the female thread in the Quark)
I called my supplier and he did some tests with the same type of adaptor on his quark. Fits perfect. He measured the outside diameter of the adaptor: 3,49 cm. Exactly the same as mine.
So we both are confused. (we do some more tests next week) If anyone had similar problem, or could measure the diameter of the thread on their quarks with a slide caliper I would very much like to know the results.
Kind regards,
Paul