Results 1 to 6 of 6
Like Tree10Likes
  • 1 Post By samastro
  • 4 Post By Ozman13
  • 1 Post By jaetea
  • 1 Post By SpyderwerX
  • 3 Post By j.gardavsky

Thread: Which magnification Barlow should I choose to have a good sampling?

  1. #1
    samastro's Avatar
    samastro is offline White Dwarf
    Points: 822, Level: 16
    Level completed: 22%, Points required for next Level: 78
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!
    Join Date
    Feb 2019
    Location
    Casablanca (Morocco)
    Posts
    11
    Points
    822
    Level
    16
    Thanks
    12
    Thanked 0x 0 Posts

    Question Which magnification Barlow should I choose to have a good sampling?



    I am planning to buy a Televue Powermate Barlow for Galaxies and Planets.
    But I am confused on the right magnification I should choose to have a good sampling.

    Here is my setup :
    * TS Optics Apo Quadruplet 100mm f/5.8
    * Canon 6D (36 x 24, 6.54 Ám) for Galaxies
    * ZWO 224MC (4.8 x 3.6, 3.75 Ám) for Planets

    Televue Powermate come in 2 models for 2" : 2x and 4x.
    But I don't know which one would give better results according to my setup.

    Thanks for your advices!
    Samir
    j.gardavsky likes this.
    Scopes : TS Optics 100mm f/5.8, Astro-Physics 130 mm f/6.3 - Mount : Sky-Watcher AZ-EQ6 Pro GoTo
    Camera : Canon 6D modified (Astrodon) - Guiding : ZWO ASI 224 MC Color

  2. #2
    Ozman13's Avatar
    Ozman13 is offline HYPER GIANT
    Points: 29,569, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!365 Days+ Registered Achievement!50 Posts Achievement!
    Join Date
    Jun 2013
    Location
    Hopkinsville Kentucky
    Posts
    8,424
    Points
    29,569
    Level
    100
    Thanks
    170
    Thanked 2,239x 2,012 Posts

    Default Re: Which magnification Barlow should I choose to have a good sampling?

    I would get the 2x, it's much more versatile and can be used much more often and in more configurations than the 4x. But that will not get you the focal length you want for planetary imaging using the scope you mention. For the planetary imaging, I would use a different scope like a Mak or SCT.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ACF 8"SCT,
    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.
    ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60,
    Oberwerk BT-82XL-ED, 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount
    Explore Scientific 82 degree and 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    &SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.

  3. The Following User Says Thank You to Ozman13 For This Useful Post:

    samastro (04-07-2019)

  4. #3
    jaetea's Avatar
    jaetea is offline HYPER GIANT
    Points: 165,084, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 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
    7,904
    Points
    165,084
    Level
    100
    Thanks
    1,224
    Thanked 3,102x 2,414 Posts
    Blog Entries
    17

    Default Re: Which magnification Barlow should I choose to have a good sampling?

    I agree with Ozman. It's difficult to get pleasing planetary images at focal lengths less than 2000mm. Your current scope is ideal for DSO imaging because of its shorter focal length, so the only way you can get that long focal length with your scope is with the 4x barlow. Unfortunately, this would really be the only use for this expensive barlow. Stick with the 2x for its versatility and when you can, get a dedicated planetary imaging scope. An 8" SCT is a prime candidate.

    Cheers,
    JT
    samastro likes this.
    Main: C-stron CPC1100 #2 Scope: 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.

  5. The Following User Says Thank You to jaetea For This Useful Post:

    samastro (04-07-2019)

  6. #4
    SpyderwerX's Avatar
    SpyderwerX is offline HYPER GIANT
    Points: 24,110, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Jan 2015
    Location
    upstate SC
    Posts
    4,520
    Points
    24,110
    Level
    100
    Thanks
    1,962
    Thanked 1,262x 1,004 Posts

    Default Re: Which magnification Barlow should I choose to have a good sampling?

    For imaging...I have no idea. But I do know that both the 2" 2x and 4x models offer an optional T-thread adapter if that is the method you use for camera attachment. I would suspicion that with the differing magnification requirements between galaxies and planetary imaging, that both would come into play at some point.

    For visual my most used is the 1.25 2.5x PM.
    j.gardavsky likes 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..

  7. #5
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 113,394, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,421
    Points
    113,394
    Level
    100
    Thanks
    14,421
    Thanked 8,799x 5,726 Posts

    Default Re: Which magnification Barlow should I choose to have a good sampling?

    Hello Samir,

    for an apochromatic telescope, the best choice is again an apochromatic or apochromatized Barlow.

    At the "lower" price end, you can take the Visual and Photographic (triplet apochromatized) Baader VIP Barlow https://www.baader-planetarium.com/e...tographic.html , I am also using with the premium eyepieces for visual.

    If you want more magnifying power, then you would need the Fluorite (CaF2 crystal optics) flatfield convertor Barlow for the factor 3x up to 8x, https://www.baader-planetarium.com/e...c)--3x-8x.html
    As your telescope is already flat field, make sure in both cases with the Thomas Baader people that there won't be any field flattening conflict with your telescope.

    I would not mount the cheap Barlows on an APO telescope.

    Best,

    JG
    jaetea, SpyderwerX and Gabby76 like this.
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Pl÷ssls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  8. The Following User Says Thank You to j.gardavsky For This Useful Post:

    samastro (04-07-2019)

  9. #6
    Clouded Out's Avatar
    Clouded Out is offline SUPER GIANT
    Points: 6,148, Level: 53
    Level completed: 99%, Points required for next Level: 2
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!750 Days+ Registered Achievement!
    Join Date
    Feb 2016
    Location
    Wiltshire, England
    Posts
    640
    Points
    6,148
    Level
    53
    Thanks
    35
    Thanked 217x 129 Posts
    Blog Entries
    1

    Default Re: Which magnification Barlow should I choose to have a good sampling?

    I have a 3x Barlow and 2x Barlow. As I don't have a driven mount, hand-guiding a webcam at 3x is really tough, as my focal length becomes over 4.5 metres. I've used a 'scope and DSLR at 9 metres but found focus very difficult.
    Equipmentally challenged.

    Website: http://philippughastronomer.epizy.com/

    Blog: http://sungazer127mak.blogspot.com/
    YouTube channel: https://
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Twitter: https://twitter.com/...ipPugh&src=typd

 

 

Similar Threads

  1. How to choose Barlow lens
    By Ortho in forum Astronomy Beginners Forum
    Replies: 18
    Last Post: 06-17-2017, 12:50 AM
  2. 2X barlow magnification
    By bardo6 in forum Astronomy Beginners Forum
    Replies: 7
    Last Post: 05-17-2014, 10:43 PM
  3. how to choose a Barlow Please
    By HiMo in forum Celestron Telescope Forums
    Replies: 7
    Last Post: 03-19-2014, 10:14 AM
  4. Barlow Magnification
    By David Winter in forum Astronomy Beginners Forum
    Replies: 6
    Last Post: 04-14-2013, 02:22 PM
  5. Is a Barlow + EP, or just an EP on its own best for given magnification?
    By VincentMcKenzie in forum UK Astronomy Forum
    Replies: 2
    Last Post: 07-10-2011, 06:24 PM

Tags for this Thread

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 09:51 AM.