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Fornax 51/52 inc MC3 Controller 40kg Load

Fornax 51/52 inc MC3 Controller 40kg Load

can be shipped within 45-60 days

Price includes VAT, plus delivery


Fornax F51 Mount at


The Fornax F51 is German Equatorial type mount. It is ideal for both fixed or mobile use and has a load capacity of 40kg. The mount is composed of aluminium alloycast aluminium, bronze and stainless steel construction and overall build quality is of a standard expected from a performance mount such as this.

Two versions of this mount are available. The standard variant has 200 step per rotation motor on the RA axis while its variant, the F52 has 400 step. The former provides normal slewing rates while the latter is much slower but offers a much finer degree of tracking control.

The periodic error of the standard F51 version is a low +/- 6 arc seconds. This can be improved to a very low +/- 0.5 seconds when fitted with the optional Telescope Drive Master Encoder.

Drive Control

The Fornax F51 / 52 is supplied with the Ursa Minor Drive Controller. This is responsible for controlling the stepper motors for slewing, positioning and tracking.

The Ursa Minor itself is given commands via either a computer running planetarium software or via a hand held remote control. For the latter, Ursa Minor offer their own handset, however the controller is also compatible with the popular SkyWatcher SynScan controller.

Apart from the initial configuration of the controller, use of a handset does not require any involvement from a PC to operate the mount.

As standard the Ursa Minor is compatible with ASCOM and can therefore interface to any other software or device that supports this standard. Autoguiding is fully supported.

The list price of the F51 with Ursa Minor does not include the cost of a handset or counterweights which must be purchased seperately.

General Specifications

Weight 35 kg
Dimensions 250x350x350mm
Axis Diameter 60mm Eloxed Aluminium Alloy
Ball Bearing Diameter 95 mm (precision tapered roller bearings in X arrangement)
Worm Gear Diameter 194 mm, 1 Modul, Bronze, 192 cogs
Worm Diameter 22 mm, hardened, ground, stainless steel (KO13)
Stepper Motors Bipolar 200 steps/rotation , 1,3 Nm (400 step for F52)
Periodic Error < +/-6 arc,  (Using TDM  < +/-0.5 arc)
Couterweight Shaft 33.7mm( 1'' KO33 pipe ) x 470 mm
Max Load 40kg


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