I'm trying to do a scene with two objects, looking along z, one at z=-5
(which I want to be in focus) and the other at about z=30 (which is out of
focus).

Camera is set:

camera {
 perspective
 angle 45.0000
 right < 1.0, 0, 0>
 up 1.47*y

 location cameralocation
 look_at <0,2,0>
 aperture 0.5
 blur_samples 10000
 focal_point<0,0,-5>
}

Even using that many blur samples, there are still artifacts in the distant
object.

Any ideas on how to get a smoother blur on the distance object?

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