Quote Originally Posted by Noble View Post
So when you are timing your development when is the "start" of the development? When you start pouring in the developer or when the last drop of the developer goes into the tank. This process can take several seconds.
I teach film developing and get people asking this once in a while. My answer is that film development times can be broken into discrete chunks of either 10 seconds or 15 seconds. If you need to time development down to the second, or can tell the difference between development of one second and the next one, then you are probably not using a daylight tank in the first place. --- While you are stressing over seconds, the rest of the class is done, has good looking film, and is moving onto the next step.