Telescopes change focus as temperature changes expand contract the length of the telescope tube as temperature increases decreases. Adding the external temperature sensor to the usb-nFOCUS adapter allows your autofocus software to and automatically compensate for these temperature changes. 

Unlike internal temperature sensors located inside the controller that are affected by the heat generated by the electronics, the external temperature sensor can be attached to the telescope to get a more accurate measurement of the ambient temperature.

In the Box

• Rigel Systems nFOCUS Temperature Sensor

• Manual & Warranty 

  Rigel Systems Warranty