Vixen SX2 Mount with ED103S Refractor Telescope and STAR BOOK ONE

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Item #VIX337-1

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  • Classic 4 inch ED APO refractor is made in Japan
  • Great for astrophotography; made with high def ED glass
  • Super sharp results with virtually no false color
  • Vixen SX2 Sphinx Equatorial Mount has dual-axis drive
  • Perfect medium weight mount for loads up to 26.5 pounds
  • STAR BOOK ONE controller is autoguider ready
  • High precision wheels and worm gears on mount for accurate tracking
  • Built-in 6x20 illuminated polar scope helps with alignment
  • Mount “center of gravity” design lets it act as counterweight
  • Includes HAL130 tripod; legs extend from 32 to 51 inches
  • Comes with one 4.2 pound counterweight and DC power cable
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  • Description

    The Vixen 25075 comes with the ED103S refractor telescope and the Sphinx SX2 equatorial mount. This is a great intermediate level dual-axis drive telescope package that can be upgraded to a Go To mount by simply changing out the hand controller! The Sphinx SX2 mount comes with the Star Book One hand controller for motorized control of both axes. A dual-axis drive telescope is great for visual astronomy, but it can also introduce you to the wonderful world of astrophotography.

    About the ED103S Refractor Telescope

    The high definition ED lens in Vixen's ED103S Refractor Telescope gives excellent optical performance in a short optical tube for easy handling. The extra-low dispersion ED lenses feature bright images from the f/7.7 focal ratio telescope and capture crisp, pinpoint star images for your eye's enjoyment. Vixen's ED glass produces clear and high contrast viewing, virtually free of false color. The design uses environmentally friendly glass technology, free of hazardous lead that helps to support a cleaner global environment. Vixen's proprietary lenses focus the full visible spectrum of visible light to a critical point. The astro-photographer will be especially pleased with the high contrast images through this telescope. The ED103S Refractor comes complete with 90mm tube rings, 7x50 finder Scope, flip mirror, and dovetail plate.

    About the Vixen Sphinx SX2 Mount

    The Vixen Sphinx SX2 Equatorial Mount is simple to operate and sets up in minutes. One bolt secures it to the tripod. Beginners and seasoned hobbyists will benefit from the portability of the Vixen SX2, the easy-to-use STAR BOOK One controller, and the ability to download future upgrades directly to the controller.

    The SX2 equatorial mount with dual-axis drive attaches to a variety of telescopes with the Vixen universal dovetail plate. The short profile declination head and internal motors greatly improve balance and motion around the RA axis, guaranteeing precise motor control. Small telescopes require no additional counterweights due to the internal placement of the the RA and DEC motors. The counterweight shaft retracts into the SX2 mount body for storage when not in use.

    STAR BOOK ONE & HAL-130 Tripod Features

    The STAR BOOK ONE Controller is a dual axis handheld controller. The 4 buttons on the controller move the mount electrically in the X and Y axis (RA and DEC). The controller includes a built in red LED light for illumination to avoid loosing night vision. Versatile tracking options are available; sidereal rate, Kings Rate, lunar rate, and solar rate. Different tracking speeds are available for time lapse photography. The controller works in both the northern and southern hemispheres. Backlash compensation provides reduced time lag at the point of reverse motion and the controller can be used for auto guiding with an auto guider compatible with SBIG auto guiders. PEC rectifies irregular motion of the tracking gear wheels that affect long exposure astrophotography.

    The HAL130 Tripod provides ample stability and has no wobble points in its design. The HAL130 has a large base to carry the Sphinx SX2 mount. The tripod extends from 32" to 51" (81cm to 130cm) and weighs 12 lb.(5.5 kg).

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    What's Included

    • Vixen ED103S ED APO Refractor
    • Flip Mirror Diagonal
    • Finder Scope & Bracket
    • Tube Rings
    • Vixen-style Dovetail
    • Vixen Sphinx SX2 Equatorial Mount
    • Dual-Axis Motor Drive
    • One 4.2 lb. Counterweight
    • STARBOOK ONE hand controller
    • Starbook One cable and strap
    • Cigarette Plug Cord
    • HAL130 Tripod

  • Dimensions & Specifications

    Optical Design:

    ED APO Refractor


    103 mm

    Focal Ratio:


    Focal Length:

    795 mm

    Resolving Power:

    1.13 arc seconds

    Limiting Magnitude:


    Light Gathering Power:


    OTA Diameter:

    90 mm

    OTA Weight:

    8.1 pounds


    Flip Mirror


    Optical Finder

    Mounting Type:

    Vixen Dovetail

    Mount Type:

    German Equatorial



    Load Capacity:

    26.5 lb. & counterweights

    RA and DEC Slow Motion:

    Worm and Wheel Gears

    Wheels Number of Teeth:


    RA Slow Motion Axis:

    72mm diameter, aluminum alloy

    DEC Slow Motion Axis:

    72mm diameter, aluminum alloy

    Worm Gears:

    9mm, brass

    RA Axis:

    40mm diameter, aluminum alloy

    DEC Axis:

    35mm diameter, aluminum alloy

    Altitude Adjustment:

    0° ~ 70 degrees latitude

    Azimuth Adjustment:

    1.2° per rotation

    Number of Bearings:


    Counterweight Bar:

    20mm diameter, retractable


    4.2 lb.

    Motor Type:

    Pulse with 250pps


    12V DC, DC Adapter Included

    Mount Dimensions:

    13.5 x 14 x 5 inches

    Mount Weight:

    15.4 pounds without counterweights



    Controller CPU:

    32bit CISC Processor, 40MHz

    Controller Display:

    Two-line STN with backlight

    Controller Power Connecting Port:

    DC12V, Center Plus Polarity

    Controller Guider Port:

    6-pole, 6-wire modular jack

    Controller Dimensions:

    5.4 x 2.5 x .8 inches

    Controller Weight:

    3.88 ounces


    HAL130, adjustable from 32 to 51 inches

    Tripod Weight:

    12 pounds

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    Manufacturer Warranty

    Default manufacturer warranty.

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