Image looks terrific, but putting a CSG lens with IOR in front of the
camera?
Ouch! what does that do to your render time?

1. I tend to use ultra_wide_angle camera instead of perspective camera to
get the 'bent horizon' effect, should work alot faster than rendering
through a lens.

2. Can't help you with the dispersion (which works pretty well with the sun
in the top left hand corner), but MegaPOV's post-process functions might be
able to duplicate/approximate this.

3. Focal blur would be easier to tweak without the lens.

4. 'Vignetting' could be done using a transparent disc with onion pattern in
front of the camera, or perhaps as part of a post-process function.

Not saying what you've done is bad, just trying to suggest some ways to
speed up a good effect.

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