Cliff Benham wrote: >> There is no reason why shortened shutter speeds can't also >> be used at lower frame rates, however. If you want to >> capture fast motion with little blur, you can use 1/1000 >> shutter speed, then transmit at 60 fps. In principle. > > This doesn't work at lower frame rates as you might think. > The blur is needed to create the impression in the mind that > the image is in motion. > > Eliminate the blur by using a fast shutter, and you cause > great discontinuity in motion. The moving image breaks up > into a series of fast moving stills. Okay, I can understand this point, and Craig also made it. Here's how he explained it: "In order to create the illusion of motion continuity at frame rates that are BELOW the flicker fusion frequency for most viewers (typically 40 to 50 fps) the shutter period for image taking must be increased to allow for some motion blur in each frame." So, as he explained it, a 60 fps source is already past the flicker fusion limit, and it therefore should be able to be taken without a lot of motion blur. Right? Which means that the motion vectors in the 60 or 72 fps transmissions should be ~ equally accurate. I realize this is all very subjective, and only real-world tests could give the answer. Bert ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.