May 25, 2012
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This tutorial by Harold Davis explains how you can use Photoshop to achieve crisp focus throught a macro image.
“The closer you get in macro flower photography, the fussier focus gets. Since “fussy” is not a technical term, let me explain. Because focus is inherently shallower as you get closer to your subject, slight variations of distance between camera and subject throw you out of focus very quickly, and even fully-stopped down you may not have enough depth-of-field for your entire photo to be in focus.
Certainly, stopping your lens down to its smallest aperture, observing whether you have the in-focus areas you want, and seeing if there is any way to position the camera to improve the amount that is in-focus is a good way to start. But bear in mind that stopping down a lens comes with some downsides: optically your lens may not perform best at its smallest aperture, and when the aperture is small you can’t use a shutter speed fast enough to stop motion.
An approach that often can surmount these obstacles is to use focus stacking: shooting at a number of different focal points and combining the images in Photoshop to create a hyper-focal image that has an extended area that is in focus.”…MORE