Adjusting the photographic exposure for stylized imagery

…The daylight system in Mental Ray is meant…to work hand in hand with the photographic exposure.…Tone mapping the image as if it was seen or lensed by a true camera.…To put this on, I'll select my camera…and break the connection to the simple exposure.…I'll press Ctrl + a, to go to the Attribute Editor.…And, in the camera shape note, scroll down to the Mental Ray section.…In Mental Ray, we can see it's mapped the physical…sky, in the environment, so the camera sees the sky.…And, put an MIA exposure symbol in.…

This exposure symbol works by gamma, pedestal, knee, and gain.…Much like a standard video camera would.…What I'd like to do though, is toss this, and put in the photographic exposure.…I'll right click on Lens Shader, and break that connection, then I'll go into the…Lens Shader on the camera, and under mental…ray lenses, I'll choose the MIA exposure photographic.…In here and shutter bugs may recognize this, we've…got valuable available for ISO or film sensitivity to light.…The shutter, how long the shutter is open expressed in a fraction of a second.…