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Need help with lens selection

Gianakakis

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Apr 27, 2019
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So I am going to build a 445 M140 blue laser and I have the lens for short-range burning but I still want to see the beam and do astronomy with it in my private house at my village (My dad owns a house with 10-15 acres of land far from the city ) stuff. Do you guys know of any decent quality lenses that output a clean beam without much divergence?
Edit: Ok so I checked out some of the amazing lenses DTR has I am in between the G8 and the DTR 3E -B what would you guys recommend?
 
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