✅ Product Description When observing in high-humidity conditions, standard dew prevention methods may fall short. The Extra Big Dew Heater from R-Sky is designed specifically for 9–10 inch optical tubes, delivering enhanced heating performance to prevent dew accumulation on large corrector plates and meniscus lenses. Perfect for larger catadioptric telescopes, including Schmidt-Cassegrain, Maksutov-Cassegrain, and astrographs with front-aperture diameters from approximately 230 mm to 254 mm. ⸻ ✅ Key Features: 🔥 High Power Output – Effective in the most demanding dew and humidity conditions 🔄 Large Heating Surface – Covers broad optical elements evenly 🧵 Flexible, Frost-Resistant Cord – 47 inches (120 cm) for easy and tangle-free routing 🔌 Standard RCA Connector – Compatible with most dew controllers (12V) 🛠 Hand-Assembled by R-Sky – Each unit is built with strict quality control and tested in real observing scenarios ⸻ ✅ Why Choose This Model? Built to outperform typical heating strips that fail in extreme moisture Consistent, uniform warmth—no hotspots, no overheating Cables remain soft and manageable even in sub-zero weather A practical solution for advanced amateurs and astro-imagers using large-aperture telescopes ⸻ ✅ Pair with a Controller (Recommended) Combine with a dew heater controller to fine-tune power output, protect optics from overheating, and conserve battery life during extended observing sessions.