Focusing or collimating ?

[Externet]

Good day. First post with lots to learn.
How to produce a ~3mm dot at 6 metres (1/8" at 20') with a 405nm module like this 12.2mm diametre, ~46mm long module that has some lensing on it. With its lens all the way in, the beam still diverges.

Do I need a housing with lens or collimator or both or other ? Would it fit in a '301' , '303' common pointer housing to use the lenses in it ?

 

[Anthony P]

That lens is not the same thread size as 303etc. It is, however, the same thread size as g2, g8, 3E and others. That looks like a standared 12mm module that will fit a variety of hosts. As for 1/8" at 20' that may be a tall order. Perhaps someone else has some ideas.