Problem.
The camera in the Blender has no look_at parameter.
Therefore from a matrix take the parameters "rotate", "translate".
All this well works, if not Blur.
For Blur it is necessary to enter the translate parameter into "location", and
to remove with "rotate".
But, how to calculate the look_at parameter????

image 1
camera {
    perspective
    location  <0, 0, 0>
    look_at  <0, 0, -1>
    right <-1.7777777777777777, 0, 0>
    up <0, 1, 0>
    angle  49.134343
    rotate  <-21.713552, 91.172234, 0.000124>
    translate <27.149088, 10.813705, -0.555530>
    blur_samples 25, 100
    aperture 0.04
    confidence 0
    variance 1
    focal_point <0,0,0>
}

image 2
camera {
    perspective
    location  <27.149088, 10.813705, -0.555530>
    look_at  <0, 0, -1>
    right <-1.7777777777777777, 0, 0>
    up <0, 1, 0>
    angle  49.134343
    blur_samples 25, 100
    aperture 4
    confidence 0
    variance 1
    focal_point <0,0,0>
}

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