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Focusing or collimating ?

Externet

New member
Joined
May 21, 2022
Messages
4
Points
3
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.
1653159493925.png
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

Well-known member
LPF Site Supporter
Joined
Oct 7, 2018
Messages
536
Points
63
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.
 




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