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Originally Posted by astro_nutt
I use a Chershire collimator first off then fine-tune with a laser.
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To varying degrees you can collimate your primary to the laser, try the cheshire again and find yourself out of collimation
It is too easy to introduce errors using a laser this way, and there is much written on this topic.
The cheshire doesnt lie and should be the reference, unless you use the barlowed laser method.
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another trick with a laser is note where the beam strikes the primary mirror with the focuser fully in and out...if the beam shifts..then your focuser is loose or not squared in!..
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I use the laser to adjust secondary tilt so that the dot hits the centre of the primarys centre spot. This ensures that the optical axis is aligned to the focuser axis, so that the focal plane is flat and the primarys collimation point shouldnt change with changes in focuser position.