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Collimation
Hello everyone.
Great site for a beginner like me. Can someone please explain how to collimate the secondary mirror on a GSO (Bintel) Newt mounted on a Dob base? I'm not sure what the center screw in the 4 vane spider assembly is used for. Does it move the whole mirror up and down the OTA or allow sideways twisting? I am a bit scared to undo it! Do the three other screws simply allow a little adjustment and should I loosen them right off before attacking the big center screw? Also, I have a Saxon laser collimating thingo but it is clearly not collimated itself. It rolls around on a homemade jig and moves everytime I turn it in the focuser or even tighten it up. It doesn't have any ajusting screws or mechanisms that I can see. I tried to make a target on a Barlow in order to use the Barlowed laser technique. Unfortunately, the end of the Barlow (with the afixed target) doesn't protrude far enough to get a good view of any return beam and center spot shadow. I tried a hand mirror but it still hard to see. Any hints?
Cheers
Ian
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