Results 1 to 10 of 10
Like Tree12Likes
  • 4 Post By Gabby76
  • 3 Post By SpyderwerX
  • 1 Post By Pauls72
  • 1 Post By Myrrdinemrys
  • 1 Post By CamelHat
  • 1 Post By Myrrdinemrys
  • 1 Post By Don Alvarez

Thread: TeleVue 2" Big Barlow vs GSO 2" Barlow

  1. #1
    Myrrdinemrys's Avatar
    Myrrdinemrys is offline White Dwarf
    Points: 929, Level: 17
    Level completed: 29%, Points required for next Level: 71
    Overall activity: 0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!20 Posts Achievement!5 Threads Achievement!Gallery Achievement!
    Join Date
    Nov 2017
    Location
    Veresegyház, Hungary
    Posts
    33
    Points
    929
    Level
    17
    Thanks
    3
    Thanked 6x 5 Posts

    Default TeleVue 2" Big Barlow vs GSO 2" Barlow



    I am planning to get a 2" 2.5x Barlow for my apo ED 60/800 for visual and AP purposes as well. I am beginner, so AP is the Moon, planets, doubles and clusters so far for me, no DSOs yet. Reading the comments I wonder if the GSO will be OK for me or not. I know a Powermate would be the perfect solution but does it worth the extra money? Is the GSO a compromise for my setup or not?
    Skywatcher ED 80/600. Skywatcher Heritage 100/400. EQM-35 Pro GOTO mount. Scopium SWA 10 mm 1.25" eyepiece. Apex 2" 28 mm eyepiece. Seben Achromatic Barlow 2x Lens.
    2x. 1.25" Variable polarizing filter. Canon EOS 750D. Canon EF-S 18-55 mm IS STM KIT. Canon EF-S 55-250 mm F/4.0-5.6 II IS. Velbon tripod.

  2. #2
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 78,706, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.9%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Hyperactive Geek - Silver 2rst place for Activity!
    Join Date
    Jan 2016
    Location
    Live: Slovakia Work: Canada
    Posts
    18,251
    Points
    78,706
    Level
    100
    Thanks
    3,448
    Thanked 5,746x 4,820 Posts
    Blog Entries
    4

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    The TeleVue “Big Barlow” is not designed to be used in a diagonal so for visual with a refractor not very useful.
    The difference between TeleVue barlows and others is the design length.
    The TeleVue gives you a longer body which gives you a more exact 2x power than “shorty” barlows which are more of a approximation.
    The TeleVue barlows were actually designed to work best with newtonians.

    I posted a formula awhile ago on how to get a more accurate figure of what power a barlow actually gives you.

    The TeleVue Powermate is a bit of a different animal as it has a few tricks it can do that a regular barlow cannot so is designed more for photography than visual.
    Though I have not had an issue, some people have claimed a powermate does not work well with some widefield eyepieces though.
    DeanD, SpyderwerX, sketrip and 1 others like this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / camera. - Gabrielle

    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  3. The Following User Says Thank You to Gabby76 For This Useful Post:

    Myrrdinemrys (09-05-2018)

  4. #3
    SpyderwerX's Avatar
    SpyderwerX is offline Neutron Sequence
    Points: 23,026, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 32.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Jan 2015
    Location
    upstate SC
    Posts
    4,454
    Points
    23,026
    Level
    100
    Thanks
    1,913
    Thanked 1,247x 990 Posts

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    A little info from TeleVue on the Powermate vs Barlow subject. Tele Vue Optics: Powermates

    I've never used the GSO, but I do hear great things about them. The one thing I love about the TV barlow is that it is completely invisible in the optics chain. Very well corrected, and plays beautifully with a quality EP.
    Gabby76, JAM and Tradertom69 like this.
    ~Frankie~ My mind: Always on...Slightly off.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Celestron CPC1100 SCT...
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Atlas EQ-G (EQ6) & Celestron AVX...
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    180 Mak...SkyWatcher ST150 & ST102...Orion ST80
    TeleVue Everbrite & Baader BBHS mirror and prism diagonals
    EPs: TeleVue (NJ) Plossls, Widefields, Panoptics and Naglers + 3-6 zoom: ...volcano top (T) Orthos & Kellners...Leitz Periplans...TeleVue, Astronomik, Lumicon & Baader filters..

  5. The Following 2 Users Say Thank You to SpyderwerX For This Useful Post:

    Myrrdinemrys (09-05-2018),Tradertom69 (09-10-2018)

  6. #4
    Pauls72's Avatar
    Pauls72 is offline HYPER GIANT
    Points: 17,956, Level: 92
    Level completed: 64%, Points required for next Level: 144
    Overall activity: 6.0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Jul 2009
    Location
    LaPorte, IN USA
    Posts
    1,796
    Points
    17,956
    Level
    92
    Thanks
    6
    Thanked 627x 483 Posts

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    Barlows usually work good for AP on the Moon and planets, all very bright objects. They do not work well on DSO's and other dim objects. They double the focal length and focal ratio of the scope, which is not what you want. If you insert a 2x Barlow, you need to increase your exposure time by 4x to capture the same amount of photons as without the Barlow.
    Tradertom69 likes this.
    Mounts: EQ1, LXD55, Atlas EQ-G (one with Rowan belt mod, EQ6-Rail and one without)

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    C11, 8" Reflector, 102mm MCT, ST80, W.O. FLT98, 6" RC, Lunt LS50THa/B400
    Cameras: Canon XTi, DSI-C, DSI, ST402, QHY8L, QHY183C, QHY163M, ASI120MC-S (Allsky)
    Some of my Pic's http://www.astrobin.com/users/Pauls72/

  7. The Following User Says Thank You to Pauls72 For This Useful Post:

    Myrrdinemrys (09-05-2018)

  8. #5
    Myrrdinemrys's Avatar
    Myrrdinemrys is offline White Dwarf
    Points: 929, Level: 17
    Level completed: 29%, Points required for next Level: 71
    Overall activity: 0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!20 Posts Achievement!5 Threads Achievement!Gallery Achievement!
    Join Date
    Nov 2017
    Location
    Veresegyház, Hungary
    Posts
    33
    Points
    929
    Level
    17
    Thanks
    3
    Thanked 6x 5 Posts

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    Sorry, guys, my post was meant into an already existing topic with the same title. Accidentally I just started a new post with the same name.

    If I knew this would be a new topic the proper title would be 2" 2.5x Powermate vs 2" 2.5 GSO Barlow.
    Gabby76 likes this.
    Skywatcher ED 80/600. Skywatcher Heritage 100/400. EQM-35 Pro GOTO mount. Scopium SWA 10 mm 1.25" eyepiece. Apex 2" 28 mm eyepiece. Seben Achromatic Barlow 2x Lens.
    2x. 1.25" Variable polarizing filter. Canon EOS 750D. Canon EF-S 18-55 mm IS STM KIT. Canon EF-S 55-250 mm F/4.0-5.6 II IS. Velbon tripod.

  9. #6
    JAM's Avatar
    JAM
    JAM is offline Main Sequence
    Points: 712, Level: 14
    Level completed: 24%, Points required for next Level: 38
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!Gallery Achievement!Album Achievement!
    Join Date
    Sep 2018
    Location
    Northern Minnesota
    Posts
    63
    Points
    712
    Level
    14
    Thanks
    18
    Thanked 5x 5 Posts

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    While the thread is HOT...
    The subject of a 2" barlow was asked while I was searching for answers from Orion whether I should
    get a 1.25 or would a 2" be better... ( 2X power)
    .
    I'm wondering what each would Target, Right now I have a temporary 1.25 -2X Shorty
    But does that choke the View on my Orion XT10i ?
    .
    Gotta Fly...
    JAM
    .

  10. #7
    CamelHat's Avatar
    CamelHat is offline Bronze Supporter
    Points: 51,180, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 18.0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!First 1000 Experience Points2 Posts Achievement20 Posts Achievement!
    Join Date
    Dec 2011
    Location
    Santa Barbara, CA
    Posts
    5,755
    Points
    51,180
    Level
    100
    Thanks
    1,158
    Thanked 1,704x 1,378 Posts

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    I have the 2" GSO 2x ED Barlow and like it very much for visual. I can't recall using it on the Moon but on stars I never noticed any color fringing.

    I can't find the 2" GSO 2.5x Barlow, do you have a link? There is a 1.25" GSO 2.5x Apo Barlow. Its specs sound impressive at a low price so I am curious if there is a 2" version.

    Also, that Skywatcher ED 60/800 in your signature, should that be an ED 80/600? I can't find the 60/800 and it sounds like an odd size.
    Don Alvarez likes this.
    ... Henk. Telescopes: 6" Mak-Newt (Comet Hunter), ES ED127CF, ES ED80, Zhumell Z12, Coulter Odyssey 10, AT6RC, Venture RX-7, Celestron Skymaster 20x80, Mounts and tripod: Losmandy G11S, AVX, LXD55, Tiltall, Cameras: Fuji X-a1, Canon SX40, Xt, XSi, T6, ELPH 100HS, DIY: Dob and camera barndoor trackers, afocal adapter, Dob with foldable base and Az/Alt setting circles, Accessories: SSAG, Plossls, Barlows, Telrad, laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software: DSS, ImageMagick, PHD, Nebulosity, Photo Gallery, Gimp, CHDK

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

  11. #8
    Myrrdinemrys's Avatar
    Myrrdinemrys is offline White Dwarf
    Points: 929, Level: 17
    Level completed: 29%, Points required for next Level: 71
    Overall activity: 0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!20 Posts Achievement!5 Threads Achievement!Gallery Achievement!
    Join Date
    Nov 2017
    Location
    Veresegyház, Hungary
    Posts
    33
    Points
    929
    Level
    17
    Thanks
    3
    Thanked 6x 5 Posts

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    My bad. No 2" 2.5x ED GSO, I meant 2" 2x ED GSO.

    Yes, my piece is the Skywatcher apo ED 80/600. This is not my day.
    CamelHat likes this.
    Skywatcher ED 80/600. Skywatcher Heritage 100/400. EQM-35 Pro GOTO mount. Scopium SWA 10 mm 1.25" eyepiece. Apex 2" 28 mm eyepiece. Seben Achromatic Barlow 2x Lens.
    2x. 1.25" Variable polarizing filter. Canon EOS 750D. Canon EF-S 18-55 mm IS STM KIT. Canon EF-S 55-250 mm F/4.0-5.6 II IS. Velbon tripod.

  12. The Following User Says Thank You to Myrrdinemrys For This Useful Post:

    CamelHat (09-05-2018)

  13. #9
    Don Alvarez's Avatar
    Don Alvarez is offline Bronze Supporter
    Points: 8,895, Level: 65
    Level completed: 49%, Points required for next Level: 155
    Overall activity: 2.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Mar 2017
    Location
    Coral Springs, Florida
    Posts
    1,542
    Points
    8,895
    Level
    65
    Thanks
    168
    Thanked 382x 283 Posts

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    Quote Originally Posted by CamelHat View Post
    I have the 2" GSO 2x ED Barlow and like it very much for visual. I can't recall using it on the Moon but on stars I never noticed any color fringing.

    I can't find the 2" GSO 2.5x Barlow, do you have a link? There is a 1.25" GSO 2.5x Apo Barlow. Its specs sound impressive at a low price so I am curious if there is a 2" version.
    I don't think so. On a side note I just did get the GSO 1.25" 2.5x Apo Barlow, I don't now how to test this empirically but I've read it's not actually 2.5x, more like 2.2x or something. Optically, it seems to perform rather well, I only tested it in my F10 achro though.
    CamelHat likes this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    10" SkyLine
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron Nextar GT90, Meade Infinity 80
    EP: The Five Fingers of Doom: 5.5mm, 8.8mm, 14mm, 20mm, 24mm Meade 5000 UWA's
    20mm, 26mm, 32mm, 40mm Meade 4000 Plossls, 30mm, 20mm, 15mm GSO Superview,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Expanse, Baader Classic Orthos, Various others.
    Binocs: 15x70 Celestron Skymaster, 10x50 Levenhuk Karma Pro, 10x42 Bushnell, 8x42 Sans & Streiffe

    Member, South Florida Amateur Astronomers Association

  14. The Following User Says Thank You to Don Alvarez For This Useful Post:

    CamelHat (09-05-2018)

  15. #10
    Tradertom69's Avatar
    Tradertom69 is offline Main Sequence
    Points: 575, Level: 11
    Level completed: 50%, Points required for next Level: 25
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!
    Join Date
    Sep 2018
    Location
    Bear Delaware
    Posts
    51
    Points
    575
    Level
    11
    Thanks
    15
    Thanked 1 Time in 1 Post

    Default Re: TeleVue 2" Big Barlow vs GSO 2" Barlow

    Thanks for the link. I have been following the TeleVue powermate for a while.

 

 

Similar Threads

  1. Imaging---GSO 2" 2XED barlow Vs. Televue 2" 2X Powermate
    By Johnny J. in forum Telescope Accessories Forum
    Replies: 2
    Last Post: 05-18-2016, 04:09 PM
  2. Celestron Barlow vs Televue Barlow Question
    By jerryva in forum Astronomy Beginners Forum
    Replies: 15
    Last Post: 01-28-2016, 05:27 AM
  3. Opinion on the Televue 1.25" 2x Barlow
    By Keeper4560 in forum Telescope Eyepieces Forum
    Replies: 8
    Last Post: 07-14-2013, 02:25 PM
  4. Is a Televue 2x Barlow suitable for a 10" dob?
    By prozac919 in forum Dobsonian Telescopes Forum
    Replies: 6
    Last Post: 01-10-2013, 02:21 AM
  5. TeleVue 2" Big Barlow vs GSO 2" Barlow
    By mzu in forum Telescope Eyepieces Forum
    Replies: 14
    Last Post: 09-24-2011, 04:07 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 08:06 AM.