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Thread: Green or red laser pointer?

  1. #11
    not_Fritz_Argelander's Avatar
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    Default Re: Green or red laser pointer?



    Quote Originally Posted by KathyNS View Post
    Also, the air scatters green better than red. You are relying on the scatter to see the beam from behind.
    True, and a fair point but it's the sensitivity of the eye that dominates. Red sensitivity is <20% of green sensitivity and red wavelengths are only ~1.2 times green. Rayleigh scattering is inversely proportional to the fourth power of the wavelength so that's only a factor of 2 so it contributes but not dominantly. It boosts the eye sensitivity of a factor of 5 to a factor of 10 favoring green. Aerosol scattering varies as wavelength to the inverse 1.2 power so it doesn't help like Rayleigh does.
    j.gardavsky and bladekeeper like this.
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  2. #12
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    Default Re: Green or red laser pointer?

    Quote Originally Posted by Techristianjr View Post
    Green. Watch out for aircraft as previously stated, especially helicopters.
    Might want to also consider if any of your neighbors are likely to flip out and call the police if they see somebody shooting a laser randomly at the sky. I have one who goes nuts when kids through rocks into our retention pond, so...
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  3. #13
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    Default Re: Green or red laser pointer?

    It looks way cooler than red as well .......
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 1989
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  4. #14
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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. Other than that it's a matter of matching the drapes.
    Is there also a difference because the shorter wavelength of green is scattered more than red?

    ETA - Note to self: scroll to end before asking!
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  5. #15
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    Default Re: Green or red laser pointer?

    Quote Originally Posted by Gfamily View Post
    Is there also a difference because the shorter wavelength of green is scattered more than red?

    ETA - Note to self: scroll to end before asking!
    In post #11 I show an estimate that eye sensitivity is about 4 times as important as scattering.
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  6. #16
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    Default Re: Green or red laser pointer?

    Quote Originally Posted by jcj380 View Post
    Might want to also consider if any of your neighbors are likely to flip out and call the police if they see somebody shooting a laser randomly at the sky. I have one who goes nuts when kids through rocks into our retention pond, so...
    We tested it with my family. While 5 mW laser looks quite bright when you stand next to it, you walk away 20 ft and it becomes invisible (as long as you pointing up and not at a person ).
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  8. #17
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    Default Re: Green or red laser pointer?

    I use the Orion glp https://www.kwtelescope.com/orion-sk...e-bracket.html with a lot of success on my SW 100ED along with the Orion RACI. On a long refactor the pointer can make a real difference with initial slewing to your starting point. Cool temperatures can cause problems with it. I often wrap a small dew heater around mine to keep it warm.
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  10. #18
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    Default Re: Green or red laser pointer?

    I actually like my little red dot finder for doing my initial 2 star align. Just turn down the intensity so you can se the star through the red dot. It’s nice and small too compared to the GSO 8x50 finder I have. That looks way cooler mounted on the OTA as another big impressive ‘thing ‘ on the scope to impress all the 25 yr old groupies but the red dot is way more practical. I do pull out my nice big green laser when I want to impress them though .....��
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  11. #19
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    Default Re: Green or red laser pointer?

    I recently picked up (from Amazon) an inexpensive green laser with a gun mount and elevation/range adjustment knobs ($20), then bought a picatinny 10/22 rail for the mount ($10) and attached it to the side of scope with double-sided tape. Tried it out night before last. Just awesome, once I aligned it to the finder scope crosshairs. The very visible green line seems to extend right into the star being observed. Very helpful in setting up initial alignment of portable scope and refining later go-to’s. So, yes, green is the way to go and the price is very low!
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  12. #20
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    Default Re: Green or red laser pointer?

    You can find the differences between power here in this video.

    https://youtu.be/woiTedSKPrk

 

 
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