Quote Originally Posted by blanconegro8rc View Post
good day to all. I am at a loss as to how to determine the progression of f stopping using my enlarging timer. what is "the ballpark figure" in getting the increments. I am not good the numbers. I am requesting you guys if you can give me a starting point. lots of thanks!

Welcome to APUG.

If you want a progression of times that has 1/2 stop increments, these numbers work well:

2.8, 4, 5.6, 8, 11, 16, 22, 32, 45, 64, 90, 128 ...

Ralph Lambrecht and Chris Woodhouse's excellent book, "Way Beyond Monochrome", has lots of useful information about these issues. Ralph posts here regularly, and his website (darkroommagic.com) has a bunch of useful aids in the Library section, including an f/stop timing table in pdf form here: http://www.darkroomagic.com/Darkroom...stopTiming.pdf