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DealExtreme 50mw Focusable 532nm Review.

ped

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Package arrived quickly, safe and sound to the UK with a decent quality Trustfire 18650 and keylock safety switch.




Initial impressions were promising.. Looks good and feels solid in your hand




As you can see above you can remove the middle section so it has a smaller body for use with a CR123
.

Next is a power reading taken after 30 seconds ON time, 11mw overspec!



And next a power reading using an Energizer Lithium CR123 and the middle section removed 15mw overspec



Close up of the de focused head



All in all a decent laser for the dollar ($31.90 delivered) and the divergence is astonishing, cleanest 532nm ive seen so far.

>>>LINK<<<

End of message
:)
 

DrSid

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The beam looks rather thin to me .. which would mean poor divergence .. can you measure it ?
 

ped

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The beam looks rather thin to me .. which would mean poor divergence .. can you measure it ?
The only "beamshot" you can see is leading upto the meter and its innacurate, i'll get a good smoked one later, or am i getting divergence mixed up with something else? /learningcurve :)

I think he did in picture #4, he said he's using a CR123 in the fifth picture so i assume he previously used a 18650..
Only a guess tho :beer:

Thats right, 61mW with a TF 18650
65mW with a CR123
 

DrSid

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Divergence is angle of the beam widening, at large distance, when focused to infinity (trying to achieve smallest possible spot at large distance). With green laser, this will be governed mainly by diffraction .. and smaller the output aperture means more diffraction.

Simply measure spot size after some distance larger then let's say 3 yards. As large distance as you can use.
 

ped

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Divergence is angle of the beam widening, at large distance, when focused to infinity (trying to achieve smallest possible spot at large distance). With green laser, this will be governed mainly by diffraction .. and smaller the output aperture means more diffraction.

Simply measure spot size after some distance larger then let's say 3 yards. As large distance as you can use.
Righteeo i'll check tonight for that.

So if i understand this correctly, if i focus it to the smallest dot possible at say 1 metre, then shoot it at a wall 10 metre's away and the dot is roughly the same size, thats good divergence?

Thanks :)
 
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DrSid

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It's better to measure size at aperture, and at a distance. Distances up to few feet can be tricky, because you can focus the beam into 'point' and then let it diverge again. That will actually increase divergence.
Simply focus the smallest possible dot at some distance you can see well (you can use mirror for doubling the distance and having the spot near to you for feedback - but WATCH FOR REFLECTIONS and use glasses). Then measure the dot at this distance.
One other way to do it is to attach the laser to binoculars, watching through the binoculars shine at some distant wall .. and adjust the focus. Again . .watch for reflection (don't do it through glass), also watch for traffic signs and license plates, they can reflect the beam right back.
 

siqueirah

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There's an interesting test you should do.
It reveals the only con I found about the laser.
Put a IR filter between the laser and the meter, or good certified anti-green goggles to try to measure the IR output.
It's a good overspec laser, but IR seems to be too high.
Anyway, it's worth.
I have it and I love it.
 




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