Quote Originally Posted by MaximusM3 View Post
At six seconds, a one second difference in exposure can actually make a noticeable difference. ... I work in f stops with 12th fractions anyway.
A 1 second change in a six second exposure is either a -.26 or +.22 stop change - about 1/2 a zone change on grade 2 paper.

f-Stop timers that work in 1/12ths or 1/10ths of a stop would make a ~.4 second change in a 6 second exposure, about a 1/5th of a zone.