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Helicopter rotor speeds vary from manufacturer to manufacturer and the shutter speed correspondingly needs to be

adjusted  to sync with the rotor speed to find appropriate rotor blur........the aperture size at such low shutter speeds

which has also to be adjusted, dependant upon the ambient lighting conditions, to achieve the required exposure level.

The helicopter motion which also needs to be accomodated (unless hovering motionless) For helicopter forward motion, camera

panning speed needs to be in sync  with the helicopter motion to achieve a sharp helicopter body image.