I’m sure other’s may have different ways of working with cineons, but I for one, have worked on a few projects this way now, and it has worked well for me.
Under version 4, DF now handles float color space, and will retain all the color information retained in the cineon file. Load the footage as normal, and then set the image LUT (right click on the display) and set it to a gamma of 1.7 or 1.8.
Now while working like this, just be sure to occasionally turn on the “show full color range” button in the display to make sure your highlights and shadows match the plate.
Others may argue that you should leave the cineon import as bypassed, but this can adversly effect things like color manipulation and alpha channel operations, as DF is designed to work in linear space.
Another technique would be to get the LUT’s from the scanning facility and apply that on the import of the cineons. I say just let DF do all the work.
Try to render your 3D as 16 bit tiff, or float if you have the drive space. This will then allow you a lot of room to color correct later. You can always render 8 bit, and then force it to float with the change depth tool, but that may contain banding coming from just 8 bits initially.