Collimation with OCAL 4.0
Just to illustrate how important scope collimation is, I seem to find myself writing more about this than about any other subject… But then again, having a properly collimated scope is of prime importance to any astronomer. There are numerous ways to collimate a Newtonian telescope, from a basic “Cheshire” eyepiece to fancy barlowed laser.…
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Collimating an SCT: the C14 magic
seeing Airy disk despite turbulence