Very interesting and I apologize for not being able to find the time to discuss fully all the photographs in the gallery and all the technical ramifications of the image/process illustrated by Bob but just wanted to say that in my high speed photography course one of the first projects the students complete is one of calibrationg a shutter against a standard (331/3 rpm turntable and a b&w TV set) >From something as simple as this a whole lot of "technical" spinoffs can be pursued. I particularly like the fact that even though the total exposure is the same everywhere the exposure for moving objects is not the same as for stationary ones. In fact, the moving subjects become their own shutters in a sense. Another approach is to note that the pinhead specular highlights are not the same in density ... the energy that would arrive at a single spot on the film if the pinhead were still is further and further spread out over a larger arc as one moves away from the center of the ttbl. That density loss could be related to pinhead velocity - I call that sensitometric velocimetry (not a very practical thing to do but makes brain work some). For one one needs to account for the increase in noise picked up from the less than perfectly black background ... hmmm, my head hurts! Anyway, IMO very nicely done - better than my students do it! click! Andy PS: in brief I find the composition/content/treatment of the photographs by Siegel, Snarski, Cigirgan and Davis particularly well done.
