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DLP7000: 'Horizontal' line in image plane with DMD in fourier plane

Part Number: DLP7000

I am using a DMD in the fourier plane of a lens, imaging with a camera (the camera and DMD are separated by twice the focal length of the lens) and illuminated with a laser.

All the images are showing that what should be a spot, is elongated in the 'horizontal' direction (the direction that the mirrors pivot in), as shown below for when all the DMD mirrors are in the same state.

The same elongation is also seen in each maxima of a diffraction pattern (when the DMD is displaying a diffraction grating) as shown below.

I am pretty confident that this effect is due to the DMD and not any of the other elements in the setup (it does not appear when the DMD is replaced with a plane mirror and its orientation rotates with the DMD) and was wondering if you would have any ideas where this elongation comes from and any advice how it could be removed?