>... as opposed to the ns lag of the microscope ... Yes. Ptobably in the 0.5 to 1 range. Grace Hopper, mother of the term "program 'bug'", explains nanosecoinds - complete with handout samples. http://www.youtube.com/watch?v=3DJEpsKnWZrJ8 R --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .