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Ian,
It sounds like 'High Humidity - Calm Warm Air' atmospheric distortion. It often causes a 'Rainbow' effect. Whereas Fog, dew, wind, dust and even heat haze tend to make objects change colour rapidly from red to blue (the twinkling effect).
Sounds like you had a warm, humid, still air night.
Another explanation can be a very fine (almost impercievable) layer of dew on your optics. This also causes the Rainbow Effect.
Last edited by ballaratdragons; 13-05-2005 at 01:03 AM.
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