Example two: Exactly the same scene with black sky, no clouds, no haze, no ground, no nothing. Can't see any refraction, but a wierd kind of negative sun effect. There is also a reflection showing in the first example even set at zero as it is, so I must be onto something with refraction causing a reflective effect. Do you understand my confusion about being able to see any refraction in the top 2 renders with nothing visible behind them? I think I just hurt my brain.

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy