How to set the camera to only focus on specific thing

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I read the Help materials about camera, knowing the Focus and Fstop value can make the camera only focus on some thing and the other objects behind or before it will be blur, but when I changed the value and Focus and Fstop, render the scene, nothing is blur.

Why? is it possible to give me a simple sample hip file to demostrate that problem? shock

P
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Hi,
There are two things to do Make sure your Fstop is set much higher than a real camera (around 100 or so works nicely) and then turn on Depth of Field in the Output driver for Mantra. Also, the quality is directly affected by the Super Sample value in the Output driver, higher is better (higher than 8x8 has no effect though)

Cheers,

Peter B
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