Warp wrote:

>   Thus, povray's focal blur is physically more accurate.
> 

That's what I thought. I didn't think about the information added to the
image, just plainly that Pov focal blur is calculated along with each
pixel, while the post-procces one does it to the image as a whole,
according to the depth of each pixel (that's how i guess it probably
works). Because of this, Pov takes into account real "out-of-focus"
effects, it doesn't just blur the already-raytraced image.

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