xiMU - Technical Manual Version 2.10
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3.3.5.
MU181 Lens Mount Adapters
There are two lens mount adapters available (S-Mount, M12 x 0.5 thread).
3.3.5.1.
ME-LA-MU-M12-M, dimensional drawing
figure 3-30, lens mount adapter ME-LA-MU-M12-M, image
figure 3-31, lens mount adapter ME-LA-MU-M12-M, drawing
Geometric Back focal Distance (measured from the top of the flange to the top of the sensor die): 8 mm.