Dual Motor Focus


Pegasus Astro Dual Motor Focus Controller v3
Focus fast, reliable and accurate your telescope using a stepper or DC motor and this controller.

Version 3 has same features, more powerful motor outputs,  in compact size!

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Dual Motor Focus brings a decade of experience in astrophotography and telescope focusing concepts. The evolution of technology in astronomy requires a system which will assist the focusing of the telescope with great accuracy. Fast optics and modern camera devices require automatic focusing in every small period of time as temperature can affect focal length and modify the optimal focus position. Pegasus Dual Motor Focus Controller (DMFC) has been developed to meet these requirements.

Dual mode

The Dual Motor Focus Controller supports two kind of motor types.

  • High Resolution Stepper motors for absolute position focusing.
  • DC motors by its Pulse Width Modulation duty cycle control.

Controller can switch motor mode from its software, Mode can be instantly changed (with one mouse click) from ‘stepper’ to ‘dc’ motor and saved in controller’s EEPROM memory

Manual and PC operation.

The controller can be operated by PC using its USB2 connectivity. A manual operation by utilising the digital encoder on the side of the controller simulates the knob of your real focuser. Turn the knob as it is the knob of your telescope’s focuser. If you press it, speed of the motor will be reduced to 1:10.

Dual Colour Indicator

A dual colour light emitted diode (Green / Yellow) is fitted on the side of the unit. Each colour indicates speed and the led can be turned on or off by its software during an observing session. Keep it pressed to disable the knob.

Robofocus compatible connector pin out

Motor output is fully compatible with “Robofocus ©” pin out. Output can drive most of the motors in the market. Take a look in our F.A.Q tab.

Temperature Probe

An external digital temperature sensor input is located near the motor connector. A digital probe of one (1) meter length is supplied. The probe can be placed near the focuser so the exact temperature of the focuser / environment can be seen through the supplied software or ASCOM driverdmfc_sensor

Backlash Compensation

Controller can compensate the backlash you might encounter in your system. Although our motor has very low backlash other setups might need this feature. Backlash compensation is supported from a function inside controller’s firmware.

ASCOM compliant

The controller is fully compatible with latest ASCOM 6 and can easily be controlled from a computer.

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Standalone program support

The controller can be operated by the standalone DMFC software. (Only available for Windows OS)

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Firmware upgrade support

Controller firmware supports re-programming via the USB 2.0 connection using upgrade software, for future upgrades which may become available. We are receiving feedback from our customers and keep updating the firmware and software with new features.

Two Years warranty

Warranty covers the controller device including the temperature sensor and the Pegasus Stepper Motor kit.

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Pegasus Astro – High Resolution Stepper Kit  (Black Universal Aluminium Anodized Bracket & Coupler)  (focuser is not included)

Supplied Motor is a high resolution geared stepper motor (Step Angle 7.5, Deg 120, Gear Ration 1:120). Its gearbox has very low backlash and high torque suitable to focus in micron scale.

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High Resolution Stepper with Black Universal Bracket & Coupler (focuser is not included)

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coupler

Motor Coupler (5mm to 8mm) – Coupler has 3 screws and can be attached in any shaft from 3mm to 8mm)

Supply Voltage 12Volt DC
Motor Compatibility DC motor – adjustable frequency PWM
Unipolar stepper motors
Bipolar stepper motors
Motor Output DC motor, max 1 Amp
Unipolar / stepper motors, max 2.0 Amps (1.0 Amps per phase)Continuous output current per channel: 1 A
Peak output current per channel: 3 A
Continuous paralleled output current: 2 A
USB Connectivity USB 2.0 Type B plug
Thermal Sensor Resolution 9-bit Celsius temperature measurements
Power Input Connector 2.1mm Centre Positive Socket
Motor Connector D Sub 9 female connector
Dimensions 66mm x 66mm x 28 mm

Pegasus Stepper Motor

Step Angle (Deg) 7.5 / 120  = 0.0625
Gear Ratio 1:120
Phases 4
Voltage 12
Current (A) 0.27
Pull-in Rate (PPS) 400
Pull-in Torque (N.cm) 60 (100pps)

Standard Package

  • Dual Motor Focus Controller
  • Temperature Sensor 1m length
  • USB type B cable

Premium Package

  • Dual Motor Focus Controller
  • Cigarette Lighter Power Adapter DC
  • Temperature Sensor 1m length
  • High Resolution Stepper Geared Motor (Step Angle 7.5° / 120, Gear Ratio 1:120)
  • Universal Black Anodised Thick Aluminium Bracket for Motor (does not bend)
  • Motor Coupler (5mm to 5mm)
  • Serial Cable for Stepper motor (1.5m)
  • USB type B cable

Q: In which focuser does it fit?

A: We have installed our universal metal adapter on the following focusers:

  • Orion Optics UK default focuser
  • GSO (RC focuser)
  • Takahashi (FSQ85,FSQ106)
  • Moonlite (2”, 2.5”)
  • Baader (Steel track)
  • Synta Focuser Refractors
  • Altair Astro (2”, 2.5”, 3”)
  • Starlight (2”, 2.5”)

Q: What kind of stepper motors it supports?

A: Bipolar and Unipolar Motors. Can deliver 1Amp per coil. 2Amps in total.

Q: Does it support Robofocus Motors?

A: Yes, controller uses same pinout. Just plug your motor and play

Q: Does it support Moonlite Motors?

A: Yes, controller uses same pinout. Just plug your motor and play

Q: Does it support Rigel Stepper Motors?

A: Yes, but you need a custom RJ12 to DB9 cable. Contact us for details to order one.

Q:Does it support Meade zero image shift focuser?

A: Yes, Meade zero image shift focuser has a DC motor. You will need a custom “mini Stereo -> DB9” cable. Contact us for details to order one

Q: Does it support JMI Motofocus?

A: Yes, Motofocus is a DC motor. DMFC fully supports these types of motors.  You have to include in your order the “Cable for DC pulse motors”

Q: Does it support 5V Stepper motors?

A: Yes, but you have to provide a 5V DC power supply to Pegasus DMFC controller (instead of 12V DC).

Q: Does it support Starlight Micro Touch Focus Motors?

A: Yes, Starlight motors are 5V motors. You need to do two things:

  • Supply a 5V DC power to Pegasus DMFC (instead of 12V DC)
  • Get a custom RJ12 -> DB9 cable to connect your motor. Contact us for details, We can provide one.

Q: Is Pegasus Stepper Motor efficient / strong enough to move the focuser under high load?

A: Absolutely. Its gearbox has a low backlash, high resolution (gearbox reduction is 1:120) so its torque is very high. You will never have a problem with that. Motor can move focuser with all the imaging equipment when telescope points to zenith.

Q: What about the motor coupler you provide. Only one size?

A:Coupler has 3 screws and can attach any shaft from 4mm to 8mm. These 3 screws ensure that you will securely lock (on axis) different shaft diameter.

Q:Where should I place the temperature sensor?

A: Just place it near the focuser. After some time telescope setup will equalise its temperature to temperature of the environment.

Q:Does it support ASCOM?

A: Of course! The controller is fully compatible with ASCOM v6. You can download the latest ASCOM driver from our support page

Q:Can I use two controller with the same software?

A: Sure, Software can connect to two controllers in parallel.

Motor kit Installation howto on different focusers


Get it from our Dealers: