This content is Copyright © 2010 by Wayne Fulton, I´m sharing as a mention of an important study and subjects for advanced or enthusiast photographers, I consider this articles a very useful resource of theory and learning.
Flash Fundamentals – Four Fundamentals We Must Know
Flash Fundamentals Part 1 – Inverse Square Law, Guide Numbers
Flash Fundamentals Part 2 – Continuous vs. Instantaneous light – vs. Shutter Speed
Flash Fundamentals Part 3 – Soft Light
Flash Fundamentals Part 4 – Flash pictures are Double Exposures
Flash Fundamentals Part 5 – Rear Curtain Sync, Colored Gel Filters
Other topics that I consider important and interesting subjects:
45 Degree Portrait Lighting Setup
Nikon Commander Remote Wireless Flash System
Comparing properties of speedlights vs studio lights
Tenth-stop Table – f-stop, shutter speed and ISO in third and half stops.
Nikon TTL history – TTL, D-TTL, iTTL
Speed of flash units for High Speed Photography
Many thanks to the author for the comprehensive theory and study presented in this articles.