Lens Shift inconsistency
sigh..unfortunately I am not versed in python at ALL. But I suppose I could snoop around and see what I can figure out. When you say engine.py, are you referring to the file called "octane.py"? Because I do not see an actual .py file anywhere that is actually labeled "engine.py", unless maybe I am looking in the wrong location? I am looking inside my blender scripts in the folder called octanerender. Also, I am looking at the .py files in the blender text editor, just in case you were wondering lol.
Which version of blender and which version of the plugin do you use?
Desktop: Ubuntu 13.04 x64 - i7-3770K @ 3.5GHz - 32GB DDR3 - GTX670 2048MB
Laptop: Linux Mint 11 x64 - i7-2860QM @ 2.5GHz - 16GB DDR3 - Quadro 3000M 2GB
Software: NVidia 319.12 - Cuda 4.2.9 - Blender 2.66a
Laptop: Linux Mint 11 x64 - i7-2860QM @ 2.5GHz - 16GB DDR3 - Quadro 3000M 2GB
Software: NVidia 319.12 - Cuda 4.2.9 - Blender 2.66a
I've introduced lens shift export in v0.92. You should download v0?93 which is the latest one. Please read all notes I put and delete v0.75 before upgrade.
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This should make your day

Desktop: Ubuntu 13.04 x64 - i7-3770K @ 3.5GHz - 32GB DDR3 - GTX670 2048MB
Laptop: Linux Mint 11 x64 - i7-2860QM @ 2.5GHz - 16GB DDR3 - Quadro 3000M 2GB
Software: NVidia 319.12 - Cuda 4.2.9 - Blender 2.66a
Laptop: Linux Mint 11 x64 - i7-2860QM @ 2.5GHz - 16GB DDR3 - Quadro 3000M 2GB
Software: NVidia 319.12 - Cuda 4.2.9 - Blender 2.66a