Crystal Sync Vs Variable Speed
Posted 01 November 2005 - 10:15 PM
i.e. if a camera shoots 24, 29.97fps Crystal and 1-50fps Variable
Posted 02 November 2005 - 02:31 AM
Now, on lower-end cameras (Arri S, IIC, Bolex), you usually have to choose, do you want a crystal motor or a variable motor? Crystal motor can be used for synch, but no slo-mo. Sometimes, you get stuck with a governor motor, which can't do slo-mo, and doesn't keep synch. However, on a modern movie camera, a range of 1-50fps is pretty normal, and when you shoot at 24fps, it is crystal 24, and synchable with sound in post.
That's the short run-down.
Posted 02 November 2005 - 03:05 AM
Crystal sync just means that the speed is extremely precise and constant, not an approximation.
For example, if a camera ran at 30 or 60 fps crystal-sync, you wouldn't have flicker problems shooting under standard 60hz gas discharge lamps / ordinary fluorescents, but if it's just a variable speed motor running at 60 fps, you'd probably get flicker from those 60 hz lamps.