Pink Lady’s Slipper (2022). This photo is the result of focus stacking 9 images to try to capture a significant portion of the bloom in focus.
One of the goals I had this season was to create a nice closeup photograph of one of our local orchids, the pink lady’s slipper, with an uncluttered out of focus background but showing a maximum amount of the blossom in focus. In the past I’ve tried this by experimenting with apertures to try to balance the amount of the blossom in focus against the amount of the background that’s out of focus. It’s been a challenge with many of the flowers I’ve found locally as they so often grow in very busy and brushy areas. So this year I decided to try using the focus stacking technique to accomplish my goal. This is a technique I’ve only rarely used, so I’m not an expert and am still learning.
Technique: Focus Stacking
Focus stacking refers to making many photographs of the same subject, one right after the other, while shifting the focus point for each photograph. In this case I used a very wide open aperture to keep the background nicely blurred. Then I focused on the closest point on the flower and made an image. Then I shifted the focus back just a little and made another photo, and repeated this until I was focused on the back of the flower. Essentially, each photo has a slice of the subject in focus and when you combine all of them in software you will, hopefully, get the entire subject in focus.
I’m not going to go into lengthy detail on the specifics of how to do this in software, but at a high level I did the following:
Selected all the individual photos in Lightroom and chose to edit as layers in Photoshop.
Selected all the layers in Photoshop, then auto-aligned the layers to line them all up correctly in case there was any slight movement between shots.
Auto-merged the layers, choosing the focus stacking option, to combine them all letting Photoshop pick the areas most in focus from each image.
Cropped the final merge to get rid of any inconsistent areas around the edges.
Performed any final edits in Lightroom.
The two photos I share today are examples of how I did. They are not perfect merges, though I am reasonably happy with the results. I’m ok with some things being a little out of focus but there are small areas of pink on each flower that I’d hoped would be in focus and are not. At some point I may spend more time on each to see if I might have captured those areas in focus in some of the images but the software just didn’t merge them correctly, and if so I would need to manually adjust the layers after the merge to try to capture those areas in focus. Or it’s also possible I just moved the focus a little too far such that I missed a slice, in which case I’ll need to try again next season.
Another Pink Lady’s Slipper (2022). This photos is the result of focus stacking 14 images, resulting in a 3.01 GB file.
Lessons Learned
If you are shooting with a wide open aperture and are close to your subject then adjust the focus in very small increments to assure you capture the entire subject. You can’t always go back and redo this later.
Try to pick days where there’s no wind, or at least very little. You don’t want the subject moving between each shot.
Use a sturdy tripod. Software can align the photos if they are not all perfectly aligned, but why risk problems? Use a tripod and get the shots as steady and lined up as possible while in the field.
Consider what software to use. I used Adobe Lightroom and Photoshop to perform all processing. This is a great combo but sometimes there are third party software packages that might do a better job with specific tasks. I’ve heard good things about Helicon Focus when it comes to focus stacking, but I’ve never tried it.
Consider how much memory and processing power this might take. I’m still working from a fairly old computer (12 years old) and this process did tax it. It became so memory constrained at times that the entire process seemed to stall and likely took far longer than it would on a more recent computer (I’ve been recently thinking about finally getting a new one).
Consider how much hard drive space this might take. Granted, space is relatively cheap in the scheme of things, but just realize that combining 14 images created on a 20 megapixel camera can result in a 3 GB merged file. If your subject requires even more images then the size will grow even larger.
Practice, practice, practice.
Conclusion
Focus stacking is a great technique that can help you create images that surpass the capabilities of whatever camera and lens you own. You can create very shallow depth of field photographs but still capture maximum detail in the specific areas you want. Modern software makes it relatively painless in most cases to create some nice images, but it can still take a little work, and it does help to practice the technique to better your skills and increase the chances of creating a final photo that exceeds your expectations.
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