[URL="http://www.youtube.com/embed/wxR8wreO3LE?rel=0?hd=1"]Video #4[/URL]

Here is an example where the laser was focused so that the most narrow part of the beam was not far enough to reach the intended target. Moving the laser closer was not an option because of the aquarium glass.

[URL="http://www.youtube.com/embed/AT4nvzSwmdg?rel=0?hd=1"]Video #3[/URL]

Here you can see that the 445nm laser is reflecting of the aquarium glass and hitting the arm. The beam is jot focused and only a small percentage of the light is reflected. The end result is that it will not burn you. Your mileage may vary. The laser operator in this video was not aware the beam was hitting his arm. However, it would still be dangerous to your eyes. Always wear the appropriate goo...

[URL="http://www.youtube.com/embed/iR-Duj5qrpo?rel=0?hd=1"]Video #2[/URL]

In this video the nudibranch meets his demise.

[URL="http://www.youtube.com/embed/lHXW2LDU_ow?rel=0?hd=1"]Video #1[/URL]

This aiptasia was as big as I have ever seen about 1 to 1.5 inches across the disk. It took about 2.5 minutes of laser time to get him.

[QUOTE=Giovanni;20758338]USE:

The laser operates much the same way as a flashlight. The on off switch is on the back. Like many modern flashlights you can focus the light in a broad or tight beam. The light the laser diode emits is of one frequency 445nm but is not focused. The lens on the business end sets the focal distance. If the laser is not focused it will not burn your target. I practiced on a piece of cardboard. This focus depth is only good for burning an few inches. This...