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MACROPHOTOGRAPHY TOOLS, TIPS & TECHNIQUES FOR DIGITAL PHOTOGRAPHERS 2012
Focus stacking to increase the apparent depth of field
Focus stacking is a technique becoming more popular with the advent of digital photography. It
involves taking multiple pictures of a specimen or scene while changing the focus point. In
macrophotography, this is done by moving the camera and lens forward or backward on a focusing rail.
The pictures are then stacked on top of each other using software (e.g., Adobe Photoshop), then
blended together to create a single image with the combined depth of field of all of the images. The
main challenge is that the subject must not move during the time the photographer takes the series of
photographs!
House fly showing two photographs one focused on the head the other on the back of the fly. The
third photograph is the combined or stacked image (image courtesy Wikipedia).
To create a focus stack you need to find a subject willing to pose while you take a series of shots. Start
by focusing on the front of the specimen – take a shot, then move you lens a little bit closer using a
focus rail and take another shot. The number of shots will depend on how cooperative your subject is
and the depth of field that exists in a single shot. Generally, if you are really close, you may need to
take five to 10 shots. A suggested starting point is to stack 2-3 images, then increase the number with
higher magnification images.
How to focus stack images using Adobe Photoshop Extended CS4, CS5 or CS6
1. Start Adobe Photoshop CS4, CS5 or CS6 and start Adobe Bridge. Open the first RAW image in
the series and adjust the exposure, white balance etc. Then click on Done. This creates an xmp
file which stores the Camera RAW image settings which we will copy to the other files. If you
shot .jpg files, skip this step.
2. Back in Adobe Bridge, select the image you just adjusted in Camera Raw. It will have a small
circle above and the top right indicating it has an xmp file. Select the image, and at the top of
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