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Thread: Choice of Eyepiece

  1. #101
    Shorty Barlow's Avatar
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    Default Re: Choice of Eyepiece



    Quote Originally Posted by Barney85 View Post
    I don’t understand why retailers sell Barlow’s over 2x, I mean if it distorts the image where it’s not even usable then what’s the point of it, it just confuses us novices lol.
    This is often a fractious debate on astronomy forums and probably leads to much misunderstanding. There are a plethora of factors to consider before using a Barlow on a telescope, notwithstanding the actual telescope itself. I have 5x Barlows and even a 5x TeleVue Powermate. They work well on my short tube achromats which have very short focal lengths. I use the 5x when I want to change their focal lengths for occasional high powered observing. My most used Barlow is a 2.5x GSO shorty, which is used regularly on my refractors and my Newtonians.



    For a long time my most used Barlow was a 3x TeleVue, which was invaluable on my f/7, 130mm Newtonian for lunar/planetary observing. It meant, for example, that I could use an ergonomically comfortable 15mm Plossl and get about 180x.



    Unfortunately, the 3x TV Barlow won't attain focus on my f/6, 150mm Newtonian (it has a Crayford focuser and these can have problems with some focal length EP's) so I had to acquire shorter 3x Barlows. The 3x TV is also 13cm tall and fairly heavy, so not always easy for me to use in a diagonal (I'm also partially paralysed in my right arm and hand).



    There seems to be a long standing prejudice with Barlows in general, possibly because many use them infrequently and aren't aware that there can be incompatibility problems with some eyepieces or telescopes. So when the Barlow exhibits problems it gets blamed rather than its actual use. Barlows are useful tools for maximising the potential of your eyepiece collection.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

  2. #102
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    Default Re: Choice of Eyepiece

    Also, it should be noted that many of the fancy wide field eyepiece designs incorporate a Smyth lens group which is functionally similar to a Barlow into the design. So it is fair to say that the wide field designs from Televue and Explore Scientific and Baader each include a Barlow lens tailored to be an integral part of the eyepiece.
    Last edited by not_Fritz_Argelander; 08-25-2018 at 05:56 PM.
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    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
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  3. #103
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    Default Re: Choice of Eyepiece

    Quote Originally Posted by not_Fritz_Argelander View Post
    Also, it should be noted that many of the fancy wide field eyepiece designs incorporate a Smyth lens group which is functionally similar to a Barlow into the design. So it is fair to say that the wide field designs from Televue and Explore Scientific and Baader each include a Barlow lens tailored to be an integral part of the eyepiece.
    It's not only fancy wide-fields, my new fifty eight degree TS Optics HR has the same thing.

    IMG_20180820_113034.jpgIMG_20180820_113705.jpg
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

  4. #104
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    Default Re: Choice of Eyepiece

    Quote Originally Posted by Shorty Barlow View Post
    It's not only fancy wide-fields, my new fifty eight degree TS Optics HR has the same thing.

    IMG_20180820_113034.jpgIMG_20180820_113705.jpg
    Yes, it's also a trick that can be used to create long eye relief as well as wide fields.
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    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
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  5. #105
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    Default Re: Choice of Eyepiece

    Quote Originally Posted by not_Fritz_Argelander View Post
    Yes, it's also a trick that can be used to create long eye relief as well as wide fields.
    Yes, that would make sense.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

 

 
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