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FORNAX 100 Heavy Duty Equatorial Mount with MC3 Controller and UMiPro Software - 100kg Load Capacity

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70.00 kg
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including VAT 20.00 % ( £1061.50 )


Fornax 100 Heavy Duty German Equatorial Telescope Mount
MC3 Motor Controller (click here for details!)
(MC3 is compatible with the Meade LX200 protocol. This makes it compatible with most telescope control software.)
Ursa Minor Pro Planetarium and Telescope Control Software (click here for details!)

Max recommended visual load (without the weight of counterweights): appr. 100kg

Max recommented photograpic load (without the weight of counterweights): appr. 80kg


This is the latest incarnation of the former Fornax 100 mount. The New Fornax 100 comes with much strengthened and improved wormbox that makes it an even more precise mount. The new housing of the worm drive is stronger and it has got an extra unit that holds it in exact position, eliminating any sideway movement that could have occured in earlier versions when changing direction under heavy load.

Designed and manufactured in the Europe Union, Fornax Telescope Mounts are a series of German Equatorial mounts for precise positioning and tracking large telescopes. These are available in various payload capacities: 50kg, 100kg, 150kg and 200kg (the latter one is coming soon). There is also a very compact, mobile version called Fornax 10 LighTrack that serves as a lightweight astro photo tracking solution.

The Fornax 100 telescope mount is a heavy duty German Equatorial mount for precise positioning and tracking extremely large telescopes up to about 80-90kg. Although there are examples of use of even heavier telescopes up to 100kg, the recommended maximum load is about 80kg for this telescope mount when used for imaging.

The mechanism of this extremely sturdy mount is being made of aluminium alloy, cast aluminium, bronze and stainless steel. The worm and the electric motor are located in an enclosed, sealed space (waterproof and dust-proof), making it less sensitive to dust and temperature fluctuations, and is practically maintenance free.

Thanks to the ingenious solution of the inner drive mechanism this telescope mount doesn't suffer from any backlash. A very large worm wheel is driven by a precisely engineered worm gear that is connected to the electric motor via a belt-drive system.

Typical periodic error (when not guided) is less than +/- 6 arc seconds (one period on the worm gear is 7.5 minutes long!)

When using a TDM (Telescope Drive Master), this can be reduced to below +/-0.5 arc seconds. (TDM is an alternative solution to guiding.)

When using auto guiding, the mount reacts immediately, so corrections are very fast and completely free of play. This is the ultimate solution for astrophotography with a high quality/price ratio!

Due to its weight and size this model is designed for observatories, not exactly a transportable model!


Weight: 50kg
Recommended maximum telescope weight: appr. 80-90kg
Overall dimensions: 300 x 400 x 400mm
Shaft diameter: 80mm, anodised aluminium alloy
Bearings: diameter 125mm, high precision tapered roller bearings in X layout
Gear: diameter 242.5mm, 1.25 modul, bronze, 192 teeth
Worm: diameter 27.5mm, multiple thread, grinded, hardened, corrosion proof steel (KO13)
Periodic Error: < +/- 6 arc seconds
Periodic Error (with TDM): < +/- 0.5 arc seconds
Stepper Motors: 200-phase step / rev., 1.3Nm
Voltage and Current: 12V DC, 3.5A peak power consumption at max. load
Counterbalance holder tube: diameter 42.4mm (1.25" KO33 tube) x length 570mm
Step-resolution: 0.5 arc seconds / step
Maximum speed: 4 degrees / second

Delivery Information:
Please contact us to discuss the possible delivery options. The delivery fee and time will depend on your location (e.g. U.K. or overseas) as well as your requirements (e.g. we can deliver fast but more expensive by air or cheap but slow by ship to overseas locations depending on your needs)



Below instructions relate to the mechanical parts only. Instructions for the MC3 telescope control are available under the description of the MC3 controller and/or the manufacturer's website.

1. The red or orange knobs serve merely for manual directional movement.
2. If you have to disengage any of the axes, it can be done with an Allen key (size???). There is a locking ring at the bottom end of the Dec axis that is being secured by a screw. This locks the Dec axis for motorised movement. Loosen it up if you have to move the Dec axis by hand.
The second locking ring that locks the RA axis is invisible, but there is a screw that can also be accessed via the housing of the RA axis (location???)
3. There are black(???) flat bolts (sort of thumbsrews...) near the housing of each stepper motor. With the help of these you can adjust the strength of the spring that pushes the wormgear against the wormwheel on each axis.
4. Polar alignment. Horizontal movement is done by two screws. 
The vertical movement is slightly more complicated. You'll have to slightly loosen up the four bolts on the two sides of the Dec axis (the lower bolts just a tiny bit), then adjust the angle of the Dec axis by the brass turnbuckle-like adjustment screw. Once polar aligned, tighten up the screws. Then check out polar alignment again. Repeat it until you got a satisfactory polar alignment.
Best method for polar alignment for a observatory grade mount is a drift alignment. There are lots of variations of how to do it. Please search the net for this  and choose one that suits your needs.



Fornax 2002 Ltd is the manufacturer of the Fornax Mounts branded products that covers a wide range of load capacities, from one of the most precise mobile tracking mounts in the world, the Fornax 10 Mark II, through the medium-heavy duty Fornax 52, that we also use in our own observatory at 365astronomy, to the really heavy-duty Fornax 100 and Fornax 150/100. There are also some real gems of telescope manufacturing as they now added a Fornax 200 mount to the list, one of these were installed in Chile. You can read about the installation of this enormous mount in our blog where we shared some images of a Fornax 200 installation: Fornax Mounts in Chile – Fornax 200 Installation

Fornax also manufactures custom made instruments that have been in service on various scientific projects all around the world. These are the BlackGEM project that is a wide-field telescope array dedicated to measure the optical emission from pairs of merging neutron stars and black holes, the HATNET project that is an exoplanet survey of  geographically distributed network of 7 small telescopes optimized for detecting transiting exoplanets, the HATSOUTH that is another exoplanet survey with a network of 6 astrograph telescope systems designed to detect transiting exoplanets in orbit around relatively bright stars visible from the Southern hemisphere, and the most curious project is the HAT PI that is 63 carefully aligned lens-and-camera sub-units attached to one huge tracking mount that will enable the detection of a diverse array of objects ranging from near-earth asteroids and exoplanets around bright stars to novae and bright gamma-ray bursts.

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