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10.0, 9.0, 8.0, 7.1, 7.0 or later
Linux, Mac, Windows
Lens Helper is essentially a defocus calculator. I have tested against measured photographs and the node produced accurate results. I have found it a handy tool to visualize the depth of field of a shot on all shows at Cinesite since building it a few years ago.
The node calculates a defocus value for an object distance (z) from the camera. It expects a depth.Z channel containing real depth values as opposed to 1/z which must be converted first. The node is intended to be used as a reference and not directly in your tree (although it won't do any harm), the result will only be as accurate as the camera and scene data provided. It can also be used to generate a realistic defocus curve that simulates a rack focus, zoom, or follows a moving object through a scene by applying animation to the focal distance, focal length, and object distance, respectively. Further info and explaination can be found in the property tooltips.
It's a great node to find out about the depth of field in your shot but sadly when working with shots that require ZDefocus/PGBokeh, which work with multipliers, you will have to visually match them to a standard defocus node set to the calculated value for a certain depth.
The node also includes a units converter and a Z picker to sample the depth channel.