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Thank you everyone for your help. I was going insane trying to figure where that G8 lense was suppose to go. Now I have a different headache. If you could help me again that would be priceless! This is indeed a Chinese laser. It's supposedly a 6W diode "tuned" to produce 8W of optical power...

Here is what I got. I hope it helps. There is some kind of adapter that Barret is selling but it seems to be missing male threads on one end so I doubt it would help.

Hello. My laser host has a 11,4x0.5 mm female thread. I have a G8 lense with male m9x0.5 mm on both ends. I also have an expander with 11,4x0.5 mm male threads. Could you please let me know what kind of adapter I need to purchase to be able to attach everything together? Expander screws...

Thank you very much for this detailed information. I've learned a lot from your post. So are lenses or expanders that are coated for a specific wavelength produce better results than uncoated ones? Almost forgot to ask. May I take a look at what's available in your shop?

Thank you for your post. At least I now can ask seller if that beam expander is coated or not. That's something I didn't know. I might give that AliExpress expander a try in future but not right now. If I remember correctly it costs around 90$ including delivery and it's a x6 magnification...

Hello I found some expander seller on AliExpress. That seller seems to sell expanders for CO2 laser mostly. Because listing says "for cutting machine, welding machine, engraving" But there was a listing for x6 expander and it said "for 450nm". I asked seller if that expander could be used...

That looks nice good luck with your sale