Matthys, The tape is still moving as fast and being optically counted just like the rotating shaft.
I'd go with the shaft encoder because they're s standard part and that's better than manufacturing your own optical encoder and the necessary light proof guides to keep the tape moving in a stable manner through said guide. But this is all guess work till I bust open a tape. As i said we opened another brand of digital tape with no speech and couldn't even figure out how they read the tape position. Tom
