What is the purpose of the Baader Steeldrive II Temperature Sensor?
The Baader Steeldrive II Temperature Sensor measures the ambient temperature at the telescope and feeds this data to the Steeldrive II controller. The controller then uses this information to automatically adjust the focuser position, compensating for thermal focus shift and keeping your images sharp throughout the night.
Where should I place the Steeldrive II Temperature Sensor on my telescope?
For the most accurate readings, the sensor should be placed in good thermal contact with the main telescope tube, away from any heat sources like dew heaters or electronics. Many imagers attach it directly to the metal of the optical tube assembly (OTA) with tape or a velcro strap to ensure it measures the temperature of the structure that is physically expanding or contracting.
How does the flat cable design of this Steeldrive II sensor help?
The flat cable is a practical design choice that prevents damage. It can be routed under dovetail clamps, through cable guides, or beneath tube rings without being crushed or pinched, which could otherwise sever the connection and interrupt the temperature readings needed for autofocus.
Is this temperature sensor required to use the Baader Steeldrive II focuser?
No, the Steeldrive II motor focuser can be operated manually without the sensor. However, the temperature sensor is required to enable the system's automatic temperature compensation feature, which is one of its primary functions for robotic and long-exposure astrophotography.
Will this sensor help maintain focus on my C11 EdgeHD during a long imaging session of the Orion Nebula (M42)?
Yes, absolutely. A large SCT like a C11 is particularly susceptible to focus shift as it cools. By providing constant temperature data, this sensor allows your Steeldrive II to make continuous micro-adjustments, ensuring that stars in your images of the Orion Nebula (M42) remain pinpoint sharp over many hours.
Does the Baader Steeldrive II Temperature Sensor work with other focus controllers?
No, this sensor is designed specifically for the Baader Steeldrive II system. It uses a connector and calibration profile intended for the Steeldrive II controller and is not compatible with focusers from other manufacturers.
