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Collimation problems


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I am not confident that I have managed to achieve accurate collimation of my Newtonian, the reason being that when the laser collimator is inserted into the focuser there is quite a bit of movement which caused the returning beam to change its position.

I am wondering if I purchased a better quality focuser as the one fitted on the scope seems to be a rack and pinion type then this may eliminate this issue and thus result in accurate collimation? Which raises another question of do I have to be careful that any replacement focuser I purchase has the correct amount of travel to achieve perfect focus.

Any help and advise on the subject would be appreciated.

Thanks

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