Also it's the angular distance that the tracer in travels in relation to the observer in that shutter period that determines the apparent length of the tracer.
If you think of the observer at one vertex (A) of a triangle, the position of the tracer when the shutter opens at B and the the position of the tracer when the shutter closes C, then the apparent length is determined by the angle BAC.
Of cource this triagngle is in the 3D space represented the simulation world, but when its plotted on our 2D monitors it will look like line of various lengths determined by the angle.
If your behind the sights that angle would be very small forming a dot in our view, If the guns to either side that angle would be a lot larger forming the laser effect.
Cheers!
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