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  1. #1
    john16443's Avatar
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    Default Recommended Barlow for About a C Note?



    I really enjoy the Baader 8-24 click stop zoom, and would like to add a Barlow to my collection. Most of my viewing is with a 2" star diagonal on the NexStar 6SE, so I'm thinking a @" Barlow with a 1.25 adapter should work OK. Is the 2" a better choice compared to the 1.25" format because I can use the zoom with either? I also have a 21mm Hyperion that I really use as a 32mm EP with the 1.25" element removed.

    Rather new to the hobby, so what does the collective wisdom of the group say is the recommended 2X Barlow at about $100.00? I know there will be many options/opinions, but I don't even know what's out there for sure, so all pertinent information is appreciated. From what I can tell, the selection may include (in no particular order):

    Zhumell ($70))
    TeleVue 2x BIG Barlow Lens 2 Inch with 1-1/4 Adapter ($180)
    Meade 2x Ultra TX TeleXtender 2 Inch Format w/1.25 Inch Adapter
    Orion
    Stellarview
    Others?

    Thanks
    Celestron NexStar 6SE and OMNI 150 XLT OTA's
    CG5-GT mount used for both OTA's
    Primary EP's - Hyperion 8-24mm and 21mm Modular
    Tele Vue 2.5X Powermate, f6.3 Focal Reducer
    Planetary/Solar Filter Kits
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  2. #2
    Canon Pete's Avatar
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    Default

    Only input I could give would be to get the one you can most afford. The Televues get good reviews .
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    C80ED, C130 Reflector/EQ3 , Ep's 8mm - 24mm Hyperion Zoom, 40mm SP, 20mm Meade Pl, 10mm Pl , 9mm Meade Pl, Celestron 2x Ultima Barlows. SW Star Adventurer.

  3. #3
    cawayne's Avatar
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    Default

    I have the 8-24 zoom and haven't really had the chance to use it much lately, bay area skies have been lame of late. I have the Orion XX12i with a 2" diagonal and went with the 2" Zhumell. I am yet to really try this so can't comment any more than that.
    Orion XX12i, Orion 9x50 RACI/Telrad
    Zhumell 2" 2x Barlow, Baader Hyperion 8-24 zoom

  4. #4
    ibase's Avatar
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    Default

    With my Hyperion zoom, I use the 1-1/4" 2x and 3x Televue barlows to good results. But the barlow gets more use on my refractors than on the SCT scope (like your Nexstar 6SE) because of too much magnification on the SCT when used with zoom's 8mm setting - the image may appear to be bigger but there are no additional details seen and may even look blurry. If you have a lot of 2" eyepieces, the 2" barlow will be useful, otherwise the 1-1/4" is fine. My other barlows are the 2" GSO type 2x ED barlow, 1-1/4" Celestron Omni 2x, Celestron 3x, but the TVs are my favorite for use with the zoom. Hope this helps.

    Best,

    Hernando

  5. #5
    pcwizard2600's Avatar
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    Default

    I have the 2" Zhumell that I use with my 6" f/8 refractor. I have been very happy with it. Televue is top of the line and always a good choice if it's in the budget. If the specs I found were correct, your 6se is an f/10, and the slower ratios can be more forgiving if you decide on the lesser expensive barlow. Ideally, if you have access to friends with scopes that have barlows, try some different ones first.
    Criterion (RV-6) 6" reflector, Celestron 10" reflector (dobsonian), Meade 2080 (8" SCT), Orion 120 mm refractor, Orion ST-80 refractor, many binos, Meade 12x50, Barska 15x70, Visioner 20x80, Celestron 25x100

  6. #6
    john16443's Avatar
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    Default

    Good idea pcwizard. I'll take some time at the next star party or SDAA meeting to try some and get more user information. You're correct about the 6SE, it is f10. The OMNI 150 is f5, so I'm hoping to find something that works well in both.
    Celestron NexStar 6SE and OMNI 150 XLT OTA's
    CG5-GT mount used for both OTA's
    Primary EP's - Hyperion 8-24mm and 21mm Modular
    Tele Vue 2.5X Powermate, f6.3 Focal Reducer
    Planetary/Solar Filter Kits
    UHC/LPR, UV/IR Cut-off, OIII Narrowband Filters

  7. #7
    briangk_77's Avatar
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    Default

    I recommend the Celestron Ultima 2x for 1.25". I like mine.
    Celestron Powerstar 8 SCT,
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    114SLT, Celestron SkyMaster 20x80 binos

  8. #8
    john16443's Avatar
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    Default

    Decided to up the $$ threshhold a bit and sprung for the TeleVue 2.5X. That should be a good all-arounder for the reflector as well as the SCT. Also added the DSLR adapter piece to allow me to directly attach the camera to the 2.5X

    I agree with you Hernando, even a 2X with the zoom on a SCT using an 8mm EP is a challenge. I'm thinking that if I stay in the 16-24mm range of the zoom with the 2.5X, it'll make things easier to view.
    Celestron NexStar 6SE and OMNI 150 XLT OTA's
    CG5-GT mount used for both OTA's
    Primary EP's - Hyperion 8-24mm and 21mm Modular
    Tele Vue 2.5X Powermate, f6.3 Focal Reducer
    Planetary/Solar Filter Kits
    UHC/LPR, UV/IR Cut-off, OIII Narrowband Filters

  9. #9
    ibase's Avatar
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    Default

    A Televue barlow is always a good buy, it won't leave you wondering later on if you could have done better if you got a lesser barlow instead. Enjoy!

    Best,

    Hernando
    Last edited by ibase; 01-30-2010 at 03:22 AM.

 

 

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