I have found it useful to render out scenes as multilayer, in case of any errors or future changes required in the composite. The EXR files can be used as inputs and put through the compositor in the normal way.
However, with animations or DOF using the defocus and camera distance, the distance value of the camera is not stored in the multilayer. A camera has to be added to the scene with the same distance settings.
I know that this wouldn’t be a problem if you had the original .blend file, but to my mind it would be more convenient if the geometry file could be kept seperate from the composite file. Is there any way of storing the camera distance information in the multilayer file?
I have z passes enabled.