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NathanTeo

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May 26, 2020
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Hi everyone

I'm from Singapore. I realised there is a lot of contradictory information of lasers and over here the people actually know what they are talking about, so I've decided to join this forum. I've been looking to get a laser for astronomy, likely a 520nm one. What power output for a green laser is recommended to get a clear beam at night? I don't want anything too powerful. Also what do you think of ebay sellers like shadowlasers. I'm not sure if they are very trustable...

Nathan
 



gazer101

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Feb 23, 2020
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Welcome to LPF! I've never bought anything from shadowlasers but a 50mW green laser should be more than bright enough for star-pointing
 

Scruffinator3K

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May 6, 2020
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Hi and welcome! So just from my experience ebay is hit and miss, but one thing to look at to help determine if a seller should be trusted is their reviews. I recently bought a 303 style "assassin" laser from ebay seller "torchforest1996_2"
They are rated over 98% with over 14k reviews. The products were very cheap but fair quality and I am extremely pleased with the green laser. It does a superb job for astronomy pointing.
 

RedCowboy

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Jul 10, 2015
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Welcome to LPF

In the USA 5mw is the legal limit for pointers however it is your responsibility to know your local laws, that said a 15- 20mw 520nm makes a nicely visible beam at night and 40-50mw is plenty visible but be aware than anything over 5mw can damage eyesight if misused.
 

Milkeeway

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Jun 7, 2020
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Even a 5mw at night for stargazing is plenty although I don’t know that mine were ever really 5mw lol! They are always more powerful than they say.
 

hakzaw1

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Apr 2, 2009
Messages
10,171
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^^^ yes 5 mW is enough BUT try finding a true 5 mW-most are much more than 5 mW- the 3$usd green 532 pointer makes much more than 5 mW so try one of those-- just take care--protect your eyes.. although accidents while stargazing are almost non-existent. you may need to know about overheating-- that has killed many lasers-- anytime it feels very warm-you may want to let it cool down --small pointers have almost no heat sinking.

532 is close to the easiest wavelength to see easily.. a 405nm would NOT be a good laser for that.
YOu may enjoy getting a 'trio' of 'pen-pointers' R-G and V -- best I saw was 6$ USD at auction and free ship.


WE have a member here that sells at ebay- he gives us special treatment by binning and sending his best to us.
He is in China so closer to you-- I gave him his LPF username after winning three optics (like prisms) for almost nothing.
at LPF he is KingKube-- IIRC his ebay name is blab 1396?? search ebay for 'KingKube' prism and that is him.. (alan)
Be sure to let Alan know you are LPF member...and that I sent you please.
he also offers two nice 532 in a larger better host and they use a cheaper (in the long run) 18650 battery--both are very well priced.

happy to help any time-- PM me

hak near Houston
 




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