Comment on Macro Technique Tutorial by dalantech
Very good of you to put out the tutorial, and great images. Your techniques obviously work very well for you.
Your technical explanations of flash duration is flawed; its not distance but intensity that dictates duration. A dimmer flash exposure is a shorter exposure. Additionally, where you set your focal plane dictates the centre of focus, not the back of it. Hold down your DOF preview button to see it in action.
Keep up the great work, and thanks for sharing!
Actually my explanation is correct: The intensity of the light that a flash produces is constant. But what does change from one exposure to anothet is the length of time the flash fires, and getting your flash closer to the subject will give you a shorter burst of light and make it easier to freeze motion.