Most Celestron finders are the same as SkyWatcher, and have 11 fine threads cut into the rear of the finder tube. However some are different and we now have a separate adapter for those Celestron finders with 8 coarser (1mm) rear finder threads. Simply remove the eyepiece and holder to check.

[SPC900 / SPC800 to Sky-Watcher and GSO to C & GSO to T adapters are also available ]

Please contact us prior to purchase if you are unsure

Tests have confirmed that guiding with the SkyWatcher 9×50 Finder to C Adapter is successful at focal lengths of 1500mm and more and is seeing dependent.

Stability is excellent if screws are tightened firmly and cables tied up.

Using a 9×50 finder as a guide-scope reduces the weight and complexity of your imaging setup and the wide field of view practically guarantees finding suitable guide stars.

Guiding software prefers a less than perfect star image, so the centre of the star mass can be better calculated. Most 9×50 finders are optimal for this “as-is” whereas small refractors can be, if anything, too sharp.

Please read this article “Thoughts on Auto-Guiding” for a more in depth analysis of the subject, which is borne out by my tests.

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