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Explore Scientific

G-11 Mount with PMC-8

  • 3,39900

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


  • All machined aluminum and stainless steel, black anodized.
  • All stainless steel hardware.
  • One 3.750” diameter needle thrust bearing.
  • One 2.000” diameter needle thrust bearing.
  • Two 1.500” diameter needle bearings.
  • 5.625” diameter, 7075 aluminum worm gear, 360 tooth.
  • Dual supported, ball bearing housed ground High Precision Brass Worm.
  • Variable slip clutch, both axes. One knob per axis design.
  • Porter Slip Ring Design
  • 1.250” diameter stainless steel shafts.
  • Through the axis polar scope mounting, works in Northern and Southern Hemisphere. Polar scope optional.
  • Instrument Weight Capacity 60 LBS
  • Equatorial head weight 33 lbs.


    Scott Losmandy is the designer of the world-famous G-11 mount and tripod that works with most popular-sized telescopes for the serious astronomer. A lifelong amateur astronomer, designer, and machinist, Losmandy understands the functional requirements of demanding astrophotography and astronomy. His designs are characterized by precision all-machined parts in aluminum and stainless steel that are not only beautiful, but built with strength that will handle heavy payloads for a lifetime of constant use. Mr. Losmandy has graciously allowed Explore Scientific to buy these mounts and add the new Explore Scientific PMC-Eight GoTo system with its precision stepper motors...

    The PMC-Eight Electronics are quite unique and special. These electronics are extremely robust. They include a Multi-Processor Micro-controller with 8 CPUs (thus the name) that run independently and are completely deterministic in their behavior. Within this multi-processor system is a 64 Kbyte EEPROM Non-Volatile Memory bank; a Wireless Ethernet 10/100 with full IP function which permits operation from anywhere using a browser, ASCOM, or APP over the web or serial port and Non-Volatile Memory used to store user selected parameters. This system is all controlled from a Windows app for PC, tablet, or phone with a full graphical user interface called ExploreStars - the first application from the OpenGOTO Community.

    The Losmandy G-11 mount is moved by newly installed high-resolution .09° 400 count stepper motors with a micro stepping controller that makes the motor work at 12,800 steps per revolution with drive rates accurate to a few arc-seconds per day.

    The ExploreStars app, available at the Microsoft App Store:, has basic functions found in other GOTO systems, with an important exception, the app and the command language driving the PMC-Eight is open source - meaning anyone can modify our software or create their own software through our Software Developers Kit (SDK) - and you can download your modified software onto Explore Scientific's electronics. Create a Messier challenge. Create a selectable list of objects you want to photograph and program that information into the software. Share it with the community of astronomers that are using this software. ES plans to offer a prize with a contest periodically for the best software package written.

    Classic four-button pattern for guiding, centering, moving and slewing on the touch screen of your tablet or phone. Selectable and User Enterable GoTo, Slewing, Centering and Guiding Rate. Your standard 1 star, 2 star alignment and 3 star alignment functions. Over 70,000 object database - but wait until you see the interface - its beauty and the graphics will impress you. Along with Sidereal, King, Lunar, Solar, and user defined tracking rates; Synchronize function; Search function; Coordinate input; Custom mount support using enterable stepper count scaling and Polar Axis Correction (ALIGNMENT PROCESS).

    For stellar objects, we are using the Hipparcos/Tycho II database. Where possible, ES has cross-referenced the Bayer, Flamstead, SAO, HD/Harvard, DM, BD/CD/CPD, and GSC catalogs. The user can search by any of these designations to find a given star. When the system first starts, it loads the 2,000+ stars of magnitude 5.5 and brighter. The user can load the additional 68,000+ star catalog as needed.

    For non-stellar objects, ES uses the RNGC/IC catalog. The system is designed so the user can update the provided catalogs and create your own catalog using tables and scripts in Microsoft Access. Also, each object has a unique ID number, so users can report errors and omissions.

    Based on the Russell W. Porter Slip-Ring design, this German Equatorial mount is manufactured with all-machined aluminum and stainless steel, and finished in black with a durable hard anodize. Removable stainless steel 1-1/4 inch diameter weight shaft w/safety knob. A 21 lb. counterweight is standard equipment, and optional 7 lb and 11 lb counterweights are available. The G-11 is rated for 100 lbs. total capacity (instruments and counterweights combined).

    Polar alignment adjustments are precision and smooth. For initial polar alignment setup, the G-11 has two bubble levels and the mount's latitude scale is laser etched in 2 degree increments.The equatorial head is supported by the Losmandy HD Folding Tripod with it's massive 3-inch diameter, continuously adjustable legs for precise leveling. The mount's 1.25-inch stainless steel polar axis is hollowed to allow through the polar axis sighting of the Northern or Southern Celestial pole, and an optional Polar Scope, to help make precision polar alignments quick and easy. The unique fully locking tangent arm design for altitude adjustment for aligning to the celestial pole is from 6-68 degrees latitude, and sports a large easy-to-adjust aluminum knob. The single knob azimuth control is bi-directional with +/- 8.5 degrees adjustment.


    Description Explore Scientific G-11 with Explore Scientific PMC-Eight GoTo System
    Item Number ES-G11PMC8-00
    Load Capacity Equipment Rating Instrument Weight: 60 lbs. (27.22 Kilos)
    Load Capacity Total Rating Total Weight: 100 lbs.
    Tripod height: Adjustable/Folding 33” - 48”
    Counter Weights Includes 21 lb counterweight and 1-1/4 inch diameter weight shaft w/safety knob. Optional 7 lb and 11 lb counterweights available.
    Dovetail saddle-plate Accepts both "D" Losmandy Style Dovetail or Vixen Style Dovetail.
    Weight EQ Head 33 lbs.
    Weight Tripod 35 lbs



    Download the FREE ExploreStars App by clicking the links above. The PMC-Eight mount is all controlled from a Windows PC, Windows Tablet or Windows Smartphone using Windows OS 8.1 or higher with a beautiful full graphical interface using our very own ExploreStars OpenGoto® Software

    The ExploreStars OpenGoto® Software has the same basic functions as most all other mounts on the market today. The download requires 2 steps. The ExploreStars app - which you download from the Microsoft App Store and then a Celestial database of the major catalogs of objects by clicking the link above or from

    Loading the 2 different software packages is really simple. First, download the ExploreStar App by clicking the link above and install it on your Windows based PC, tablet or smartphone. Then download the Celestial Database by clicking the link above and after the download is complete, unzip that file. You will find a folder called ExploreStarsComplete and drag that folder into your pictures folder on your Windows based PC, tablet of smartphone. Launch the ExploreStars App on your device and give the device a minute or two to upload the Celestial Database. The tablet may say Data Missing. If that occurs, click the "AppBar" button and select the "Load Extra Stars" button. Wait a minute or two and the tablet should be good to go. 

    The software includes a standard 2 star or 3 star alignment procedure, over 70,000 star database, the Messier Catalog, Solar System objects and many of the most sought after objects for imaging and viewing. The software interface features a Classic four-button pattern for guiding, centering, moving and slewing on the touch screen of your tablet or phone.

    An APPBAR button or pull down menus open to offer the intuitive 2 star and 3 star alignment procedure, selection of the various catalogs, guided tours, the sync button, the park position, search feature and the coordinate input screen to enter RA and DEC coordinate information. Numerical key pad allows for selectable and user enterable GOTO speeds for slewing, centering and guiding rates. You can also set sidereal, king, lunar, solar, and user defined tracking rates. The NGC, IC and several other catalogs are included for free via the Celestial Data download.

    Below is a SHORT video on how to download the ExploreStars App and the Celestial database.  

    Below is a LONGER more detailed video on how to download the ExploreStars App and the Celestial database as well as how to use the many features of the ExploreStars App. 

    Now, because we offer the software as an open source, we make this software different so that YOU can write your own code and import it into this software. Create a Messier challenge. Create a selectable list of objects you want to photograph and program that information into the software. With the ability to write your own code, you can create whatever your heart desires. Share it with the community of astronomers that are using this software. 

    In addition, this mount can be controlled by any ASCOM compliant software using the built-in wireless ASCOM driver or serial port cable. GPS-compatible and auto time / date settings are dependent on included receiver on computer, tablet or phone.

    If you are an experienced astrophotographer, click here to get the ExploreStars PMC-Eight ASCOM driver.

    If you are a beginner and want to use your mount with ASCOM software, click here to download the ASCOM platform and on the top right you will see the ASCOM Platform. Select  to install the platform. After you install the platform, click here to install the ExploreStars PMC-Eight ASCOM driver.

    If you are a programmer and/or interested in learning the details of the PMC-Eight, Click here to download the OpenGoTo PMC-Eight Software Developers Kitwhich includes the ASCOM driver and lots of information about the PMC-Eight and OpenGoTo source code.

    Here is a list of most of the ASCOM software packages available for use with the Explore Scientific with PMC-Eight mounts: ACP; APT; AST / ATC & Ricerca (Omega Lab); AstroArt; AstroMB; Cartes du Ciel / Sky Chart; CCD AutoPilot; DeepSky; Deepsky Planner; DFM Engineering; Earth Centered Universe Pro; EasySky; Eye and Telescope; Project Pluto; Hallo Northern Sky; Maxim DL; MaxPoint; PinPoint Astrometric; Prism; Sequence Generator Pro; Sidereal Technology; The Sky; SkyMap Software; SkyTools 3;  Star Atlas PRO; Sky Observer; StarryNight; Stellarium; Virtual Moon Atlas; and WorldWide Telescope.  

    Limited Warranty is two years on all electronics. Register by Clicking Here.


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