The Celestron 1mm T Thread Adapter for Straight Through Finders connects cameras with T thread to Celestron 9 x 50 Finders with 1mm pitch rear finder thread. Most Celestron finders are the same as SkyWatcher, with 11 fine threads cut into the rear of the finder tube.
However some are different and we now have this adapter for those Celestron finders with 8 coarser (1mm) rear finder threads.
Simply remove the eyepiece and holder to check.
Please ask before purchase if you are unsure.
9 x 50 finders are in effect 50mm telescopes with a focal length of around 180mm.
“Thoughts on Auto-Guiding” explains how they work well as guidescopes.
Our tests have confirmed that guiding is successful at focal lengths of 1500mm and more though “off axis guiders” are recommended for telescopes prone to mirror movement, especially larger models, and where exposures are lengthy.
Stability is excellent if screws are tightened firmly and cables tied up.
Using the finder as a guide-scope reduces the weight and complexity of your imaging setup and the wide field of view guarantees finding suitable guide stars.
Adapters are near parfocal with visual focus of the finder.
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