Narrow Band IR Wide Band IR Ratio (2 color) IR 0.655 0.865 0.905 0.93 0.98 1.08 1.55 1.64 2.3 3.43 3.86 4.5 5.0 8.0 10.6 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% 11% 12% 13% 14% 15% 16% 17% 18% 19% 20% 21% 22% 23% 24% 25% 26% 27% 28% 29% 30% 31% 32% 33% 34% 35% 36% 37% 38% 39% 40% 41% 42% 43% 44% 45% 46% 47% 48% 49% 50% 51% 52% 53% 54% 55% 56% 57% 58% 59% 60% 61% 62% 63% 64% 65% 66% 67% 68% 69% 70% 71% 72% 73% 74% 75% 76% 77% 78% 79% 80% 81% 82% 83% 84% 85% 86% 87% 88% 89% 90% 91% 92% 93% 94% 95% 96% 97% 98% 99% 100% °F °C K 932°F to 5432°F 1930°F 1914°F - 1947°F 33°F 1899°F - 1967°F 68°F 1886°F - 1988°F 102°F 1874°F - 2013°F 139°F