If you look at the top of your camera there is a small circle with a line across it. This is location of the focal plane. You will be surprised just how far back in the camera it is - but if you measure from the front of the lens mount to where that focal plane marker is it will be 44mm. (I know these marks exist on Nikon cameras - they are 46.5mm back I think)
Cheers
David T
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