Zorki-S retro camera

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I continue to study Rhino and KeyShot. This is my second model – my Zorki-S retro camera.
Modeled in Rhino, rendered in KeyShot and little post-production in PS.
Any comment will be very appreciated.
And I need council –- in what the reason of emergence of white pixels in the center of the image? I specially didn't remove away them at post-processing.

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One more shot.

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Some more shots – experiment with DOF.