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Thread: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

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    Default Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope



    So, Santa is getting me an Orion shorty 2x barlow for use on my Orion 80mm go scope refractor.
    I thought I would give it a quick try before it goes under the tree. So here is what I did. (in daylight)

    1. Pointed the scope out my window at the top of the farthest chimney I could find.
    2. Without the barlow, tested both the 10 mm and 20 mm eyepieces to see if I could get a decent image. (success)
    3. Inserted the barlow between the 10mm eyepiece and the diagonal. (the only place it really can go)
    4. I had to turn the focus ALL THE WAY to the other extreme and then I can just barely get the image in focus. Right at the limit of the focus.
    5. With the 20mm eyepiece I cannot get into focus. The focus knob reaches its limit before I can get clear.

    Close objects I can focus in on, but not the farther. This makes me concerned that moons and stars wont even work.
    Backing the eyepiece out a bit makes it even worse. Its almost like the eyepiece can't get put in deep enough yet both the eyepiece and barlow are at their deepest.

    Am I doing something wrong? Will this not be a problem with stars and moon gazing?
    Scopes; Orion GoScope 80 mm
    eyepieces; Orion Kellner 10mm 20mm
    Cameras; Sony A6000
    Binoculars; Minox 8X40

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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    The barlow is pushing the image plane too far back for the inward travel of the focuser to compensate for.
    If you can somehow reduce the length of the train it should be better.
    Others may have a suggestion how to do this. Maybe there is a lower profile diagonal available or perhaps a 45 degree erecting prism will suffice.
    Why not just use shorter focal length eyepiece, say 5 mm which has double the magnification of the 10 mm?
    It's always better to eliminate the barlow as convenient as they can be.
    The Sparrow and SpyderwerX like this.

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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    What size diagonal are you using?
    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
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    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    Just to be clear, are you running out of adjustment with inward travel or outward travel of the focuser? If it's outward travel you can usually correct that with extension tubes. If inward, then the tips Goldstar pointed to are the usual answer.
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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    Also when looking out a window you may have heat plumes interfering with achieving focus.
    SpyderwerX likes 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"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    It is inward travel. I fear that this particular barlow (and maybe others too?) are just not compatible with this modest 'beginner' scope. Perhaps returning the barlow and getting a decent plossl 6mm eyepiece is a better way to go. I found mention elsewhere on the web that 'shorty' barlows can require a LOT of inward travel.
    Scopes; Orion GoScope 80 mm
    eyepieces; Orion Kellner 10mm 20mm
    Cameras; Sony A6000
    Binoculars; Minox 8X40

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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    Quote Originally Posted by The Sparrow View Post
    It is inward travel. I fear that this particular barlow (and maybe others too?) are just not compatible with this modest 'beginner' scope. Perhaps returning the barlow and getting a decent plossl 6mm eyepiece is a better way to go. I found mention elsewhere on the web that 'shorty' barlows can require a LOT of inward travel.
    Hello The Sparrow,

    some Barlows require more inward travel than the others. In past, this has forced me to change the focuser.
    Drop a line to our Shorty Barlow, there are not many Barlows he would not have.

    Best,

    JG
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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    Hello The Sparrow,

    so drop another post, like something in The New Fun Jokes,

    JG
    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, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    I have a regular 2X Parks barlow. It isn't short. Worked on my f/4.5 13" reflector, works on 80mm refractors, and worked on a 6" Maksutov. Maybe the 'shorty' makes it less compatible with the scope?

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    Default Re: Newbie trouble focusing with orion shorty barlow on orion 80mm refractor goscope

    Quote Originally Posted by j.gardavsky View Post
    Hello The Sparrow,

    so drop another post, like something in The New Fun Jokes,

    JG
    Thanks, I'll do that. Whoops, This makes 30 posts I will PM him now
    Scopes; Orion GoScope 80 mm
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