An imaging module includes a front case which is configured to mount a lens unit on a subject side, a rear case which is mounted to the front case and configured to seal an imaging substrate in an interior space between the rear case and the front case, and a bracket mounted to the rear case. The fastener comprising a non-magnetic fastener body retaining a ferro-magnetic nail. The magnets may have self-cleaning belts. Addressing the memory in such a manner may allow each butterfly data set of a subsequent FFT stage to be stored to a single memory location. Visual and emission device calibration features used in conjunction with calibration reference images allow uniform selective distortion of the flexible membrane. The standby lightpaths are pre-cross-connected lightpaths that provide connectivity between switching nodes having a fiber link of degree-2 or higher.