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Very interesting question,
Undoubtedly my Argo Navis is such a handy tool and I have some stunning eyepieces and filters, however, after considerable thought on the subject I think my EZY Collimator double pass laser would have to get the gong. Mind you, it really should be shared with my other Tectron collimating tools.
If your scope is not correctly collimated than all other accessories become meaningless.
Regards
Trevor
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