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Old 08-09-2018, 08:45 AM
Startrek (Martin)
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Startrek is offline
Join Date: Dec 2017
Location: Sydney
Posts: 1,257
Guidescope focus

Just some feedback on my method of focusing my guide scope
It’s an Orion 50mm mini guidescope with helical focuser and my guide camera is ZWO ASI 120MM. Scope is a 6” f6 newt
I remove the camera,install my Orion 20mm illuminated reticle eye piece, slew to a star ( say Altair) centre it , adjust focus using the ring/ wheel, slew to my target say the Lagoon nebula, centre it , remove eye piece , install my guide camera , connect to PHD2

Question: is focus based on your eye sight through an eye piece good enough for the ZWO ASI 120MM camera to lock onto a guide star

I have read and seen on YouTube clips etc....that you are better off having your guide camera slightly “out of focus” for successful calibration and subsequent guiding

Appreciate some advice and comments

Thanks in advance
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