I believe Crow Hunter has explained the failure of RFs in rain. Depending upon how far one is ranging, beam divergence becomes a real issue. At long range a tripod is necessary. Today with mid 20 degree F temps, using an older Leica 1600 CRF (tripod mounted), I ranged large rocks at 1467, 1763 and 1836 yds. The readings would not always repeat exact ranges as initially read; but I believe them to be accurate. The 1467 range has been confirmed by actual shooting using elevation data from my ballistics chart. I am sure this ranging performance would be impossible in rain.
