This is the latest incarnation of the former Fornax 155 mount. The New Fornax 155 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.
Robust Body
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, 150 kg and 200 kg (the latter one is coming soon). The Fornax 155 telescope mount is a heavy duty German Equatorial mount for precise positioning and tracking extremely large telescopes up to about 100 kg. Although there are examples of use of even heavier telescopes up to 150 kg, the recommended maximum load is about 100 kg for this telescope mount when used for imaging.
High accurate tracking
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. Typical periodic error (when not guided) is less than +/- 6 arc seconds (one period on the worm gear is 7.5 minutes long!) Whit absolute encoder, this can be reduced to below +/-0.5 arc seconds. 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.
The MC5 GoTo controller with hand box
The control was developed by Ursa Minor for large mounts and is ideal for Fornax mounts. Of course, the control unit is delivered readily adjusted with the mount. About 50,000 objects are already contained in the database.
Power supply 12 V to 30 V - we recommend 24-30 Volt stabilized power supply
Maximum current consumption 2.5 A (controller only)
Computer connection - USB available
Autoguiderport ST4 level available
DSLR control (2.5 mm stereo jack) available
Scope of Delivery:
- Mount
- Controller with handbox
- Mountingplate
Note: Counterweights per KG 11 EUR (please specify when ordering)
Due to its weight and size this model is designed for observatories, not exactly a transportable model.
Products specifications
| Technical Data | | Mount weight | 70 kg | | Max payload capacity: | 120 kg (counterweight excluded) | | Photographic payload: | 90 kg (counterweight excluded) | | Overall dimensions: | 320 x 584 x 770 mm | | Shaft diameter: | 100mm, anodised aluminium alloy | | Bearings: | diameter 150mm, high precision tapered roller bearings in X layout | | Gear: | diameter 292.5mm, 1.5 modul, RA gear is made by bronze, 192 teeth | | Worm: | diameter 33mm, multiple thread, grinded, hardened, corrosion proof steel (KO13) | | Periodic Error: | < +/- 6 arc seconds | | Periodic Error (with encoders): | < +/- 0.5 arc seconds | | Stepper Motors | 200-phase step / rev., 1.7Nm | | Voltage and Current: | 24V DC, 3.5A peak power consumption at max. load | | Step-resolution: | 0.25 arc seconds / step with MC5 and 0,03 arc seconds / step with OC5 | | Maximum speed: | 4 degrees / second | | Counterbalance holder tube: | diameter 42.4mm (1.25” KO33 tube) x length 570mm |
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