Well I can't seem to get the same sort of effect that you got - even with your mat.

Can you show a screen shot of the material settings you used - with your 15.jpg? 

I'll try that on my sky image then, but at the moment I'm just guessing - I think the middle lens is more like a CD.... Lol!

The left one has your mat - the right 2 have mine.

Oh, and your sky settings might make a difference too... so if you could manage a screen shot of them too... ?

Measure your mind's height
by the shade it casts.
Robert Browning (Paracelsus)

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