I've seen many techniques for focus stacking, but none as easy as this one demonstrated by Photoshop Principal Product Manager Bryan O'Neil Hughes.
He's using a feature in Photoshop called focus blending, essentially the same thing, where you have multiple images of the same scene, but captured at different points of focus. The trick, is to blend or stack the images so that all parts of the scene are sharp. This is particularly useful in macro photography when the high magnification produces a very shallow depth of field.
Adobe has included focus blending in Photoshop since CS4. So chances are good that you have this ability right now.
Leads to this story from Petapixel.com and ISO1200.com.
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