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Old 06-27-2009, 07:24 PM   #1
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Question How far can 5mw 654nm red laser pointers point?

IMPORTANT: How far can a 5mw 654nm red laser pointer point?

I mean like you can still see the dot.
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Old 06-27-2009, 07:32 PM   #2
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Default Re: How far can 5mw 654nm red laser pointers point?

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Originally Posted by lazerbeam View Post
IMPORTANT: How far can a 5mw 654nm red laser pointer point?

I mean like you can still see the dot.
I would say the dot would be visible for a couple hundred yards.

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Old 06-27-2009, 08:24 PM   #3
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Default Re: How far can 5mw 654nm red laser pointers point?

It really depends on the divergence of the laser, if it's focusable or not, or where it's focused. I assume you know about divergence and that laser beams doesn't stay thin forever. From a couple hundred yards away, the dot would be HUGE. You could also use a beam expander/telescope to get a smaller point from distances, but like I said, it will be very hard to get a small dot from that far away, no matter how bright.
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Old 06-28-2009, 01:46 PM   #4
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Default Re: How far can 5mw 654nm red laser pointers point?

thanks!
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Old 06-28-2009, 08:21 PM   #5
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Default Re: How far can 5mw 654nm red laser pointers point?

It depends a lot on ambient brightness of course, and also from where you are observing the dot - I guess you mean for the one holding the laser? Shining it on a wall outside in bright sunlight, for example, you'd probably have problems seeing it more than a few meters away; in darkness, there should be no problems from a hundred meters (assuming a typical 1mrad or less divergence).
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