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Hi Jason,
My sight tube is aligning the optical axis of the primary mirror and the focusser. Alignment is achieved when the sight hole is aligned with the centre spot of the primary. The secondary has previously been aligned using a sight tube to ensure the mirror clips can be seen equally and the secondary looks circular.i have also used a web cam and Al's collimating aid to do the same. Whether I use a long tube Cheshire or the device being discussed I achieve the same collimation result.
Regards philip
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