Thanks guys.
Alistair. The prism is in front of the sensor and I have an empty filter slot anyway. I have lined it up by eye but as I cannot guarantee that In am looking at it square, I thought I would test it's position with a flat.
Bill and Suavi. Thanks for the ideas. At this stage I am planning on leaving it where it is on balance. The shadow only shows up if I stretch the absolute crap out of a flat and I almost always crop anyway.
I am also trying to minimise the handling of the innards of the camera. Hopefully may get to do a proper test tonight and see what effects it has.
Cheers and thanks again
Malcolm
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