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Peter
I had A vixen VC200L and there were several ways to collimate it. Vixen stated that the BEST way way to do a series of steps visually starting with the primary mirror etc. I thought I could do better with a laser but to be honest although I paid top dollar for it it was not concentric in the barrel and no amount of shiming made it really accurate.
I went back to the visual method and nailed it with Vixens explicit instructions. For some systems like a Newtonian that's tried and true a laser is excellent but a complicated compound system forget it as the eye is more accurate as long as the manufacturer has defined a set of steps to follow.
Just my 2c and I sold the laser.
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