Nice, but without 1.4 it's useless after 6.
There's an f/0.95 version, but it costs ten times as much.
Sumbled upon this watch using F stops to indicate time. Clearly designed by somebody who has not heard of summi and noctiluxes 🙂
http://www.neatoshop.com/product/F-Stop-Watch
Only photographic watch I want to buy is one where the face is an incident light meter.. 🙂