Ok, one thing I don't understand about beam collimators - when this was raised in another thread, a link to the vendors web site was put up and this showed pictures of collimators - they were small round tubes.
Being small round tubes, they're obviously meant to be fitted internally in something like a dichro holder.
However, won't making the laser beam a fat beam internally make it miss the mirrors?
I would have thought that to collimate a beam you'd have had to do it externally by fitting the collimator over the glass on the beam aperture.
Anyone answer this?