Thanks, TIG.
It appears running correctly.
You are a champion.

This is a good plugin but it appears to work in inches only.
I've positioning a cámera at 2.00 meters height and Camera_Stats reports 78.74 units to Z eye and target coordinates.
It's possible ad all of the other units options (feet, milimeters, centimeters and meters) to plugin?
I don't know how to do due to my poor knowledge to ruby.
Thanks in advance.