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Calling all Alpha owners or PGL-III-A-532nm, need your help.

Vlad_13

Vlad_13

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Feb 24, 2009
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Got it yesterday, it's a 100mw version but average output is 155-205mw with best batteries.

I'm not too happy with Beam Divergence, the dot on a distance 10-13m is the size of a quarter, 2-2.5cm. I unscrewed the shutter cap and adjusted the lens the best a could... but i could not get it smaller than that :( (factory "set" it was 2.5-3cm, so i got it down a little bit)

I would like to know how big is your dot at 10m. Did you adjust it yourself or it was like that. If you did the adjustment, how did you do it.

Thanks for your help.
 





RA_pierce

RA_pierce

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You can swap out the lens for one with a little longer focal length and you may be able to get better results.
This divergence sounds about right, though. It takes time to get used to.
Have you calculated the divergence in milliradians?
 
XCreedX

XCreedX

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Jul 4, 2008
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Yeah, I had that same problem with my green, I just spent like 3 hours micro-adjusting the lens till i had a dot that i was satisfied with, I would say try adjusting it at 100' and try to get the best results you can.
 
Vlad_13

Vlad_13

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RA_pierce said:
Have you calculated the divergence in milliradians?
Click to expand...

No idea how to do that, do i need to?



XCreedX said:
Is your alpha under warranty?
Click to expand...

It is but i would not be to fun sending it to China, it's straight from CNI :)

I think i will give it another shot with some help and do the 100 feet calibration/adjustment...




BTW how far does the beam goes? (even with no so good divergence) Just curious.
 
Last edited:
XCreedX

XCreedX

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Hey ken that link never works for me, it just loads for a long time and nothing happens, does it do that to you?
 
S

steve001

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Vlad_13 said:
Got it yesterday, it's a 100mw version but average output is 155-205mw with best batteries.

I'm not too happy with Beam Divergence, the dot on a distance 10-13m is the size of a quarter, 2-2.5cm. I unscrewed the shutter cap and adjusted the lens the best a could... but i could not get it smaller than that :( (factory "set" it was 2.5-3cm, so i got it down a little bit)

I would like to know how big is your dot at 10m. Did you adjust it yourself or it was like that. If you did the adjustment, how did you do it.

Thanks for your help.
Click to expand...

If after adjusting the beam diameter you still are not satisfied do what RA_pierce suggested. I swapped the original lens for a lens with a focal length of 27mm. That's the maximum. Make certain the lens is anti-reflective coated. Go to Edmund Optics look for a PCX lens
VIS 0
 
Kenom

Kenom

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Wow that's some green text. Looks like someone vomited on my screen. can't even read it until I highlight it. wooooooo. LOL

No the link doesn't work for me any longer either. Pseudo used to be a prominent member of this community but he's decided to be even more elite than anyone else and completely dissapear.

BTW, Being elite in my book is a bad thing.
 
scopeguy20

scopeguy20

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Jun 28, 2007
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I used 28 feet and am used to seeing about 14 mm dot size with most CNI green lasers . so that w/b about 1.5 mrad
 
dr-ebert

dr-ebert

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It's easy. 1cm dia at 10m distance = 1mrad. So your beam is about 2mrad. Not good, but not bad either. I think the divergence on greens is usually worse than for reds or violets.

Also, take into account that a beam at that distance won't have sharply defined edges. It will be spread out. Optimally, you'd have a central bright dot and a series of concentric rings around it. You'd need to calculate the divergence only from the central dot. It's easiest if you shine the laser onto a black surface so you don't get too much distracted by the scatter.
 
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