I'm not sure I understand you right in regards to the delivery/default 
thing...but accessing film back is easy:
*cmds:*
import maya.cmds as cmds

cmds.getAttr("myCameraShape.horizontalFilmAperture")
cmds.getAttr("myCameraShape.verticalFilmAperture")

*pymel:*
pm.PyNode('myCamera').getShape().horizontalFilmAperture.get()
pm.PyNode('myCamera').getShape().verticalFilmAperture.get()

default value for setting/getting is in inches so be sure to do your 
conversion from mm if you need to.

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