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ASA DDM100 Direct Drive Equatorial Mount


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  • Special item requiring a 20% deposit when you place your order. Please email OPT or give one of our OPT telescope experts a call at 800-483-6287 to order
  • Takes away completely the need to “Guide” the telescope mount for advanced visual and astroimaging users
  • Equipped with high resolution up to 28 bit (0.004 arcsecond) encoders on each axis
  • For time frames or questions, please contact us at 800-483-6287.

Product Details

  • The ASA DDM100 Direct Drive Equatorial Mount uses ASA’s proprietory “Direct Drive” technology which incorporates the highest capability & quality absolute encoders, plus ASA’s proprietory drive software unique to the DDM Series developed by leading global expert Phillip Keller. ASA’s exceptional accuracy GPS system plus engineering process & manufacturing tolerances & production techniques enable the ASA DDM Series to achieve what no other Equatorial mount series is able to do globally.

    Guiding Made Obsolete

    The ASA DDM100 Direct Drive Equatorial Mount takes away completely the need to “Guide” the telescope mount for advanced visual and astroimaging users. Guiding is simply obsolete when using the ASA DDM Series. Other mounts may claim this capability but in practice, the ASA DDM’s actually gets there while no other product actually achieves this. This mount is highly recommended for all high end & ultra-advanced astronomy installations where the highest capability is required.


    This new design based on ASA’s 15 years of experience with Direct Drive systems. The ASA DDM Series places you the user as ready for the most demanding situations in pointing and tracking performance. The load capacity is 100kg / 220lbs on a polar wedge. To achieve excellent tracking and pointing performance ASA Direct Drive systems are equipped with high resolution up to 28 bit (0.004 arcseconds) encoders on each axis, directly embedded into the electrical windings of the ultra-high-quality electric motors on the mounts RA & Dec axes.

    The second aspect of this control accuracy is the unique software which is a major development in unguided drive technology and unique to ASA. After modeling the pointing with the ASA software package, the positioning error is way better than 5 arcseconds, the tracking performance is in the range of +/- 0.25 arcsec up to 10 minutes. The ASA DDM100 is an absolute must for usage for any entry into any kind of research work, including astronomical observation and satellite tracking.

    Main Features

    • Tracking precision: < 0.25” RMS within 5 minutes tracking time (for altitude 20° to 85°; without seeing effects and with a pointing model in use) over 5 min
      0.05” RMS/min
    • Pointing precision: < 8” RMS with pointing model (for altitude 20° to 85°)
    • Slewing speed: 10 degrees/sec
    • Load capacity: 100kg
    • Motor: ASA Direct Drive
    • Software: ASA software
    • Weight: 56kg without counterweights and dovetail plate

      This ASA DDM100 Direct Drive Equatorial Mount is a special order item and requires a 20% deposit when you place your order, and the balance will be required before the telescope leaves Austria. This deposit is fully refundable as long as you cancel your order before the telescope is imported. Please email OPT or give one of our OPT telescope experts a call at 1-800-483-6287, if you have any questions about this product.

      Caution: Due to the size and weight of this telescope, it is strongly suggested that a customer have appropriate rigging gear, handling equipment, and personnel to assist, at hand when attempting to raise and attach this telescope to any mount! Use appropriate caution for personnel and equipment safety.

    • specifications

      Drive TypeDirect
      Encoder Resolution28
      Head DesignEquatorial
      Instrument Capacity220.5 lb
      Telescope ConnectionVixen Style
      Tracking Accuracy5 Arcseconds
    • included items

      • ASA DDM100 Direct Drive Equatorial Mount
      • ASA Control box
      • 2x Counterweight 20kg
      • Counterweight rod 80/600mm
      • Power cord
      • Power supply
      • Internal cable pipe
      • Equatorial pier (optional)
      • Dovetail plate (optional)

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