The lens analysis utility is the primary tool V-Ray supplies for creating, previewing, and editing V-Ray lens files (*.vrlens). It contains a camera distortion analyzer and a tool for correcting/distorting images. The VRLENS files can be used in Cinema 4D, 3ds Max, Maya, etc., to provide realistic (measured) camera distortion (as opposed to the simple quadratic and cubic modes). The VRLENS format also supports zoom lenses, and the distortion parameters are linked to the focal length of the V-Ray Physical Camera. So, as the camera is zoomed in and out, the distortion parameters are automatically varied. This provides for a very realistic level of camera distortion simulation.
The lens analysis utility can be accessed from the tools or bin folders located under C:\Program Files\Maxon Cinema 4D Rnn\plugins\V-Ray\tools. Additionally, it can be opened from Start Menu > Chaos Group > Lens Analyzer.
Windows: start the lens_analyzer executable from C:\Program Files\Maxon Cinema 4D Rnn\plugins\V-Ray\tools
macOS: start the lens_analyzer executable from Applications/Maxon Cinema 4D Rnn/plugins/V-Ray/tools