Results 1 to 6 of 6
  1. #1
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 172,829, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 32.0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts AchievementGot three Friends
    Awards:
    Reply Award
    Join Date
    Nov 2010
    Location
    Nova Scotia
    Posts
    25,166
    Points
    172,829
    Level
    100
    Thanks
    6,659
    Thanked 14,981x 9,540 Posts
    Blog Entries
    3

    Default GLP recommendations?



    I am thinking of doing some public outreach events in a few months, for which a green laser pointer is pretty much essential. I see that the vendors I normally use have versions from Orion and Meade. Any opinions about these, or about others?

    When talking about GLPs, safe use around aircraft is always a hot topic. We have very little low-level air traffic here, maybe half a dozen aircraft a year (not kidding!), and no airports anywhere nearby. However, we are under the main route from the eastern States to Europe. Everyone going to or from Europe flies over us. The Meade GLP advertises that its beam is visible to 25,000 feet. I assume this means that it (and similar units) should be safe if I accidentally hit an aircraft at 35,000 to 45,000 feet? (Yes, I'll be careful, but just checking.)

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier);
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    .

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  2. #2
    AustinPSD's Avatar
    AustinPSD is offline Super Moderator
    Points: 56,828, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 2.0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGot three Friends20+ Friends Achievement!5+ Referrals Achievement!
    Join Date
    Sep 2009
    Location
    McDonald Observatory, Mt. Locke
    Posts
    6,923
    Points
    56,828
    Level
    100
    Thanks
    743
    Thanked 5,865x 3,115 Posts
    Blog Entries
    1

    Default Re: GLP recommendations?

    We use the pen pointers from Optotronics:

    Optotronics Green Pen Pointers

    I use a 40mW version indoors, and the 150mW version outdoors.
    CGEM 800 HD, NexGuide, Orion XT8 Limited Edition, Oberwerk BT-100, Canon 20D/20Da/T3i/60D/5D Mk III, various eyepieces, adapters, geegaws, widgets, and tiddlybits

  3. The Following User Says Thank You to AustinPSD For This Useful Post:

    KathyNS (12-19-2014)

  4. #3
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 172,829, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 32.0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts AchievementGot three Friends
    Awards:
    Reply Award
    Join Date
    Nov 2010
    Location
    Nova Scotia
    Posts
    25,166
    Points
    172,829
    Level
    100
    Thanks
    6,659
    Thanked 14,981x 9,540 Posts
    Blog Entries
    3

    Default Re: GLP recommendations?

    Quote Originally Posted by KeithBC View Post
    I assume this means that it (and similar units) should be safe if I accidentally hit an aircraft at 35,000 to 45,000 feet?
    I think I've answered my own question on this point. Based on the divergence angle, the beam would be about 12.8 metres in diameter at 35,000 feet. That corresponds to a reduction in light intensity of about 73,000,000x. And of course, none of the photons that are scattered off the air make it to altitude. So, while I will still be carefull, I won't obsess about those Europe-bound pilots.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier);
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    .

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  5. #4
    skfboiler's Avatar
    skfboiler is offline SUPER GIANT
    Points: 10,550, Level: 70
    Level completed: 50%, Points required for next Level: 300
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!50 Posts Achievement!5 Threads Achievement!First 1000 Experience Points750 Days+ Registered Achievement!
    Join Date
    Apr 2011
    Location
    NW Indiana
    Posts
    794
    Points
    10,550
    Level
    70
    Thanks
    188
    Thanked 207x 177 Posts

    Default Re: GLP recommendations?

    I have the Orion Skyline laser and I like it. I use it as a finder so I found another GLP (different brand) on Ebay for under $20 USD . Ebay has several 5mw GLP's in that price. I've had both for 3 years now and still going strong.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Astroview 6 EQ 6 inch (150mm) f/5 reflector w/Orion EQ-3M Single-Axis Drive and Orion SkyQuest XT12g
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    f/4.9
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Eyepieces: Orion
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Plossl 25mm, 10mm, 6.3mm, Orion Stratus 24mm, 17mm, 8mm & 5mm, & 2x Shorty
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Camera: Canon EOS T3i
    Calumet Astronomical Society
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    href="http://cleardarksky.com/c/Chicagocs0.gif?1" rel="lightbox[signatures]">
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  6. The Following User Says Thank You to skfboiler For This Useful Post:

    KathyNS (12-19-2014)

  7. #5
    jaetea's Avatar
    jaetea is offline Maven-like Entity
    Points: 159,636, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 8.0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!2 Posts AchievementFirst 1000 Experience Points20 Posts Achievement!
    Join Date
    Sep 2011
    Location
    Honolulu, HI
    Posts
    7,909
    Points
    159,636
    Level
    100
    Thanks
    1,224
    Thanked 3,100x 2,414 Posts
    Blog Entries
    17

    Default Re: GLP recommendations?

    Hi Keith,

    It might be fun if you can find a willing subject to go 35,000' away from you (direct shot - line of sight) then shine your GLP at them and get their observations on what they saw or didn't see. If you hear screaming you may want to terminate the experiment early!

    Clear skies,
    JT
    Main: C-stron CPC1100 #2
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    8" f/7.5 Dob mounted Newt AP
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    TPO 6" RC f/9 &
    ES 80mm f/6 APO G&G Scope: Meade 102mm f/7.8
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Guide Scopes: 70 & 80mm fracs Mounts: C-stron AVX CGEM & GT Alt-Az, Cameras: Canon T3i 2, ASI120MC Binos: 10X502,10.5X70,15X702, 25X100 EPs: ES: 21 100°, 30 82° X-Cels: 9,12,18,25 Clubs: RCA & HAS

    HOME »
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    I never met a scope I didn't want to keep.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    "My God, it's full of stars."
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  8. #6
    Hilbily's Avatar
    Hilbily is offline SUPER GIANT
    Points: 5,839, Level: 52
    Level completed: 45%, Points required for next Level: 111
    Overall activity: 1.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Jun 2014
    Location
    SW VA
    Posts
    696
    Points
    5,839
    Level
    52
    Thanks
    41
    Thanked 143x 136 Posts

    Default Re: GLP recommendations?

    I can recommend a home built using a PL520 Osram direct green diode, that will work in cold weather.
    The common diode pumped green lasers (DPSS) don't work or are very low power below about 40F.
    Mike
    XT8G, ES 16”, 10"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , TSA120, C80ED, & SkyScanner
    ES 82° 30mm - 4.7mm, APM 18 & 24
    APM 100, PCF WP II 10x50 & 20x60, 15x70 Ultra, 7x35 Kmart, CEM60, Twilight I

  9. The Following User Says Thank You to Hilbily For This Useful Post:

    KathyNS (12-20-2014)

 

 

Similar Threads

  1. ETX-125 EP recommendations
    By Nevdawg in forum Astronomy Beginners Forum
    Replies: 8
    Last Post: 05-02-2014, 08:14 AM
  2. USB Hub Recommendations
    By Rytch in forum Telescope Accessories Forum
    Replies: 14
    Last Post: 03-31-2014, 02:21 AM
  3. Recommendations
    By xxquartzxx in forum Astronomy Beginners Forum
    Replies: 6
    Last Post: 12-03-2012, 10:51 PM
  4. CCD recommendations?
    By KathyNS in forum CCD Imaging Forum
    Replies: 4
    Last Post: 07-14-2011, 03:08 PM
  5. Recommendations
    By zoltain in forum Binoculars Forum
    Replies: 12
    Last Post: 01-13-2009, 06:10 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 01:13 PM.