Observing the Sun in H-alpha requires precise filter tuning, but cold temperatures can cause your blocking filter to shift out of alignment, reducing contrast and solar details. The R-Sky Heater for Blocking-Filter maintains the correct wavelength and prevents dew buildup, ensuring uninterrupted solar observations. ✅ Designed for Lunt Solar Systems – Compatible with 90° star-diagonal blocking filters ✅ Prevents Wavelength Shifts – Keeps your filter tuned in cold weather ✅ Easy Installation – Securely attaches with a silicone-coated elastic strap ✅ Efficient Heating – Works with a 12V power source for consistent performance ✅ Compact & Lightweight – No added bulk to your telescope setup 🔭 Enhance your solar observations – no more dew, no more shifting wavelengths!