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The motion blur in Maxwell Render 2.6 has been vastly improved both in terms of speed and capabilities. It is now possible to have virtually unlimited motion blur steps. Effects such as light trails during long exposures are now easy to create and a moving emitter will influence the illumination in the scene along its entire exposure time just as in the real world. A previous limitation where instances could not have motion blur has now also been removed.
Photo camera shutter vs film camera shutter (rotary shutter)
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Maxwell Render can calculate two types of motionblur: for the entire object and also for individual moving vertices of the object (deformation motionblur). As deformation motionblur needs more RAM when rendering (depending on the number of vertices the object has), and is only needed if the object actually deforms, you have the choice to activate only normal motion blur or also deformation motion blur.