hakzaw1
0
- Joined
- Apr 2, 2009
- Messages
- 10,662
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My cousins from over 5km away have often remarked to me how they can clearly see the beam of my 445nm laser when I point it into the night sky.
There are special lasers for survival signaling.
They have a narrow angle fan pattern to
make it easier to get the light where it has
to go. With a regular laser it is very difficult
to keep the dot on something that is so
many miles away.