Monoxide says-
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..it doesnt really matter how big or small the telescope is, it still needs to be collimated with some precision to get the best images out of it..
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No, I don't think that it matters all that much. You see it is the case that the elipse to the mirror is the same all over the mirror. An elipse on a concave mirror maintains the same eliptical shape throughout the mirror. Magnification on the edge of the primary mirror will be the same as in the centre of the mirror. The only reason that I would think that laser collimation was introduced could have been to collimate the mirror to a star guidance system that sometimes comes with expensive telescopes. You know those guidance systems that position a star dead centre in the lens. The only other reason would be that the tube of the telescope might come into frame if it is not centred properly. Like I say, it's not rocket science to centre a secondary mirror in front of a primary mirror. It just gets a little bit harder when you try to work out focal length et cetera., But then you would be building a telescope if you used that little formula.
