The Focus Fusion Society › Forums › Research › Camera films at rate of 5 trillion images per second
A camera like this could see the size, shape and maybe the density of a pinch. http://www.electronicproducts.com/Optoelectronics/Lasers/Camera_films_at_rate_of_5_trillion_images_per_second_fast_enough_to_practically_capture_light_standing_still.aspx
This relies on a special laser light source so in a FF device it may be overwhelmed by the light from the plasma.