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Thread: Green or red laser pointer?

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    Default Green or red laser pointer?



    Now having a 9x50 RACI finder I have found it much easier to accurately line up my scope, however when slewing over half the sky to find my second alignment star I could see the appeal of a laser pointer being able to go straight to it without searching through the optical finder. I have read some posts on the forum regarding green laser finders, but surely a red laser would be less damaging to your night sight?? Also, what sort of range would be required to give good results?
    SCOPE -Celestron AstroFi 5" SCT f/10. Computerised fork mount controlled by smartphone/tablet or newly aquired Nexstar+ handheld controller. Powered by 18Ah deep cycle sealed battery. Celestron 9x50 illuminated RACI finderscope. 1Mw Green laser.
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    Default Re: Green or red laser pointer?

    I think you will find that a green laser will show up better against the sky than a red. Also, in many places, a 5 mW laser pointer is the legal limit on output. Make sure you are aware of these restrictions in your local area first, and as always, maintain a vigilant awareness of aircraft and be sure to shut the laser off after acquiring your field of view.

    The green laser isn't bright enough to impact your dark adaptation unless you accidentally point it at your eye.
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    Bryan
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    Default Re: Green or red laser pointer?

    There is a reason that laser pointers that are intended for astronomical use are usually green.
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    Default Re: Green or red laser pointer?

    Definitely green. Red beam will be too dim against the sky. Not sure about the range, you want 5 mW power.
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    Default Re: Green or red laser pointer?

    Many thanks for all replies, I'm still learning.
    SCOPE -Celestron AstroFi 5" SCT f/10. Computerised fork mount controlled by smartphone/tablet or newly aquired Nexstar+ handheld controller. Powered by 18Ah deep cycle sealed battery. Celestron 9x50 illuminated RACI finderscope. 1Mw Green laser.
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    Default Re: Green or red laser pointer?

    Note that the normal UK limit for laser pointers is 1mW.
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    Default Re: Green or red laser pointer?

    Green. Watch out for aircraft as previously stated, especially helicopters.

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    Default Re: Green or red laser pointer?

    The human eye is more sensitive to green. Other than that it's a matter of matching the drapes.
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    Default Re: Green or red laser pointer?

    Ah, was not aware of that... not much use at that power so I'll give it a miss. Many thanks
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    Default Re: Green or red laser pointer?

    Quote Originally Posted by not_Fritz_Argelander View Post
    The human eye is more sensitive to green.
    Also, the air scatters green better than red. You are relying on the scatter to see the beam from behind.

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