S16 Type Mounted Collimating Coated Glass Lens with Focus Adjust

I'm not sure what's supposed to be better about this lens over the standard 3 Element type - it produces a nice small spot of about the same size and at about the same focal point. Seems to be a bit brighter, cutting though 3mm plywood takes less passes than with my 3 Element lens, but its not a massive difference.

The lens is of high quality, has a o-ring half way up the threads to help hold the lens in place, but for me its not quite in the right place, so the usual trick of a wrap or two of PTFE thread tape was needed to keep the lens held steady.