Even if you know how to operate your SLR camera and external shoe-mount flashes, you might not have any understanding of the complicated, technical mojo going on that limit and affect your photography. This uber-informative lesson by photographer Paul Duncan brings you up to speed on how things like focal plane shutters and “second curtain sync” work.
http://www.petapixel.com/2011/02/04/lesson-on-slr-shutters-and-how-flash-synchronization-works/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed:+PetaPixel+(PetaPixel)