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Thread: Thejoy of the green laser!

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    Default Re: Thejoy of the green laser!



    I went to the local auto parts store and they let me go back and poke around until I found the right stuff...the laser I have is 21mm too big for the Orion and too small for the bracket I had so...the American way is to improvise! All I know is my back didn't hurt when I went to bed last night...it's the only way to go! Happy night sky!
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    Default Re: Thejoy of the green laser!

    It is very cool just to point a laser into the night sky,last night i forgot to take mine out & i was shooting some video of saturn.i was using my small mak cass but it was not aligned.so when i had got the shot of saturn i thought i'd look for a dso just by looking right & down of arcturus,hoping to hit the top of virgo.so as i was slewing in that way i came across the faintest dso that i have seen to date.there was a small star a bit below it,if not for that i may not have stop't.the dso was like a disk in my 20mm ep with a a,f,o,v of 68* & giving me x,75mag.so for the 1st time i had that wish feeling,wishing i had my laser with,to let me know were i was pointed.anyway i put my x3 barlow on & it made it bigger but as you know with barlow's less bright,it was very round & it was as if a small round part of space was moving across my ep!!!!i just wish'st i had my pointer.

    As for that i think if you can trust yourself & can't see or hear planes then your safe,i take keith's point but if they were annoying pilots of a plan that you can't see or hear then they wood be against the law but they aren't. Ps if anyone knows the dso that i was looking at please let me know,am thinking galaxy. Then just before going to bed i saw the iss,i got it in my cross hairs,but buy the time i had a look in my ep it had gone!!! Dam!!!

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    Default Re: Thejoy of the green laser!

    The nice thing about the laser is: it's only on while pointing the scope, once you find the object you simply shut it off and your ready to go. There is no danger of hitting an aircraft because you're not looking into the eye piece when it's on...just thought I would clear that up in case anyone was wondering. I reiterate the laser is IMO just like a firearm I treat it like my .45 if a person is cautious they will never have a problem with a laser. Happy Night sky!
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    Default Re: Thejoy of the green laser!

    Quote Originally Posted by Kipper-Feet View Post
    I am currently researching night-vision, red and green flash lights (torches), red and green lasers.

    If the green laser beam presents no risk to your naked eyes as an observer when aiming it away from you, how and why does it present a risk to the observer who is viewing the green beam through the eyepiece of a telescope to which it is attached as a finder / pointer?

    I have not previously found an authoritative reference to this risk.

    With thanks in the hope of some additional learning. My concern is that in recent viewing sessions my coach had repeatedly used his green laser to direct me, while looking through my Telrad, 9x50 finder-scope and ultimately, through the eyepiece of my 8" Dobsonian itself.

    No other agenda implied.
    ======

    Interesting train of thought Kipper. I just stumbled on to an article (unrelated to this specific topic) however, it did mention at one point, that red LEDs are the only light source which will not distrub night adapted vision. Reason being, they are the only element which produces a very narrow red wavelength. Other sources such as incandescents with red coatings, and lens covers etc, are more broad-band emitters and will, dependening on intensity, have a negative effect on night vision.

    Unfortunately, I didn't bookmark the article. But if I can find it again, I'll provide the link.

    Not entirly where you were headed, but I thought it was an interesting factoid.
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    Default

    I suspect that while red LEDs are certainly narrower band than other red lights, if you make them bright enough your night vision's going to be knackered anyway - one of the red LED torches I've picked up is so bright that it leaves spots in your eyes if you look at it, so I'd be surprised if it didn't mess up your dark vision... And I wouldn't be too sure that just using it as a torch on something close wouldn't mess things up too - it's way brighter than most astro ones...

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    Default Re: Thejoy of the green laser!

    One of the reasons green is better than red for pointers is that the green scatters better when it hits fine particles so the beam is more visible. On this count, blue would be even better, but blue takes more power and messes up night vision. Maybe scattering would be too much?
    The GLP is a great tool when showing people around the sky, and helping others to aim the scope.
    I agree with gsongpmw about treating it with respect like a firearm.
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    Default Re: Thejoy of the green laser!

    Quote Originally Posted by jerryTheC View Post
    I suspect that while red LEDs are certainly narrower band than other red lights, if you make them bright enough your night vision's going to be knackered anyway - one of the red LED torches I've picked up is so bright that it leaves spots in your eyes if you look at it, so I'd be surprised if it didn't mess up your dark vision... And I wouldn't be too sure that just using it as a torch on something close wouldn't mess things up too - it's way brighter than most astro ones...
    ============

    I have no doubt, any wavelength at a high enough intensity, will fry your retina (certainly spoiling your night vision)

    I got the impression the article was talking about reasonably low-level light sources (like those typically used by amateur astronomers) of what are generally consider to be "red" spectrums, and pointing out that in fact, these lights are not all equal with respect to their effect on adapted vision. That at an equal given level (LUX or lumens? ) the purer red LED had a lesser negative impact on night vision then red-treated white-light sources.

    Just passing on what I thought was interesting info. I own a variety of both types, and haven't really noticed any difference, provided I don't shine any of them directly in my face.

    Although- I now find myself overwhelmingly tempted to do just that!
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    Default

    That makes sense though I picked the torch up at Astrofest . It seems to be the red equivalent of some of the high brightness white torches, with a number of dies in one LED...

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    Default Re: Thejoy of the green laser!

    I was thinking about making one of these myself but a lot of star parties do not allow green laser pointers. I still might put one together to use for personal viewing...also for the fun of it! I love a good tinkering session!

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    Default Re: Thejoy of the green laser!

    Great Idea. Think I'll try that just for the fun of it! Good tinkering project. I agree, have to be very careful, though. Lon ...

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