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Old 12-30-2014, 04:46 PM #1
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Default Need some help.

I bought a Chinese PM-851 2000 mW green laser. It didn't come with the battery so I'm running it off 3 AA cells instead of the 3.7v that couldn't be shipped on a plane. Anyway.... I need it to burn aptasia pest anemones in a saltwater aquarium and there's no lens on it. Without a lens I can't concentrate the beam enough to light a match let alone kill a pest coral.

Any DIY options out there?

Suggestions?

Thanks.


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Old 12-30-2014, 06:24 PM #2
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Default Re: Need some help.

Well the whole thing is junk. Took it apart. There was a small clear plastic disk that is domed that was jammed between the brass laser housing and casing. (UV filter???) so I pulled that out. Now the "lens" that came with it (very rough focus ability down to maybe a 6mm dot at 10') makes the "dot" turn into 2 dots..... I'm just gonna hit it with a hammer and not buy a $12 Chinese laser next time. Lol.
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Old 12-30-2014, 07:01 PM #3
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Talking Re: Need some help.

Quote:
Originally Posted by Menace View Post
Well the whole thing is junk. Took it apart. There was a small clear plastic disk that is domed that was jammed between the brass laser housing and casing. (UV filter???) so I pulled that out. Now the "lens" that came with it (very rough focus ability down to maybe a 6mm dot at 10') makes the "dot" turn into 2 dots..... I'm just gonna hit it with a hammer and not buy a $12 Chinese laser next time. Lol.
LOL

Shocked that a $12, 2 watt green laser was not up to spec?



Ow
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Old 12-30-2014, 07:12 PM #4
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Default Re: Need some help.

Nope..... Not shocked at all.
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Old 12-30-2014, 07:45 PM #5
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Talking Re: Need some help.

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Originally Posted by Menace View Post
Nope..... Not shocked at all.
It was in jest...you didn't seem shocked.

The blue (445) seems to be good on those corals btw.


There's a thread that also discusses this:

Lasers for Controlling Saltwater Reef Aquarium Pests - A One Stop Shop

Hope that helps!

Last edited by Teej; 12-30-2014 at 07:47 PM.
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