How does the Starlight Instruments Thermistor improve my astrophotography?
It enables your Focuser Boss II to perform automated temperature compensation. As your telescope's temperature changes, focus will drift. This thermistor feeds live temperature data to the controller, which then makes micro-adjustments to the focuser to keep stars perfectly sharp all night long, eliminating the need for you to manually refocus.
Is this Thermistor compatible with the Starlight Instruments EFS controller?
No. This thermistor is designed specifically for use with the Focuser Boss II Electronic Focuser. It is not compatible with the single-focuser EFS (Electronic Focusing System) controller.
Where should I place the Starlight Instruments Thermistor probe for the best results?
For optimal performance, the probe should be placed where it can accurately measure the ambient air temperature around the telescope tube. Secure it to the optical tube assembly (OTA) itself, ideally near the focuser or primary mirror, but avoid direct contact with metal components like finder brackets or focuser bodies that may retain heat from electronics.
How do I set up temperature compensation on my Focuser Boss II with this thermistor?
Setup is handled through the Focuser Boss II software. Once the thermistor is connected, you will use the Temp Comp Wizard, which provides on-screen, step-by-step instructions to calibrate the probe and configure the compensation routine for your specific telescope.
My focus on my Celestron C11 drifts while imaging the Orion Nebula (M42). Will this thermistor solve that?
Yes, this is precisely the problem the thermistor is designed to solve. When paired with your Focuser Boss II, it will monitor the temperature changes that cause focus drift on your C11 and automatically adjust the focuser, keeping your images of M42 sharp throughout the entire session.
I'm using a large refractor for an all-night imaging run. How does this thermistor maintain focus as the temperature drops?
The thermistor provides a constant stream of temperature readings to the Focuser Boss II. The controller's software uses this data to build a temperature-to-focus position curve. As the temperature falls, the controller predicts the necessary focus adjustment and moves the focuser in tiny, precise increments to counteract the thermal contraction of your refractor's tube, maintaining perfect focus continuously.
