Cloudray N04 Compound / Universal Engraving Nozzle

I suppose there are some of you who have bought and used this unit.
Can it be used with only one of the lenses? What is the purpose of having the two lenses? I have an OMTEC 60W with 1.5" length. I understand the longer focal length gives a better quality when cutting? Can I use that same two lense setup to engrave? Any additional info anyone can provide is greatly appreciated.

There is a link on the Cloudray page for Russ’ video. The double lens’ give you the finest point / dot possible for fine photo engraving.

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