I tend to tweak the angle and position and other camera settings quite a lot in Indigo while I test a render, and it is often impossible (at least very time consuming) to recreate exactly the same angle of view in Blender. rotation on the different axes behaves slightly differently in Blender than in Indigo. so instead, I save my camera-tweaked scene from Indigo and then open up the .igs in a text editor and copy just the xml for the camera into a new document. in order for it to work, it needs to be nested within xml tags for<scenedata>:
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<scenedata> <camera> etc... </camera> </scenedata>
so, clearly, this is not always necessary, but it is very satisfying to know the camera can be locked in when you get just the right shot you were looking for in Indigo.
the new camera.py replaces the one in Blender add-ons in indigo/properties/camera.py
(that's on Mac OSX)
let me know if this is a help to anyone!