How can I quickly choose an aperture for a specific depth of field?

Asked 7/7/2013

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2 answers

I understand that aperture affects both exposure and depth of field. What I want is a practical way to choose an aperture when I need a specific focus zone and background blur.

For example, if I know my focal length, I’m about 1 meter from the subject, and I want roughly 10 cm of depth of field to keep several nearby objects sharp (such as LEGO figures lined up), how can I determine the aperture I need without trial and error?

Is there a rule of thumb, chart, or calculator for this? I’m especially interested in something fast enough to use for subjects like insects or flowers, where I may not have much time.

depth-of-field lenses aperture technique focus

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

13y ago

2 Answers

What you are looking for is a way to quickly determine which aperture setting will allow the Depth of Field (DoF) you desire.

There are several ways to do this:

Create or purchase a portable DoF Calculator
Create and print a DoF Table for each of your lenses
Load an app like DOFMaster on your iPhone or Android phone
Use an online DoF Calculator to determine the aperture you need before the shoot
Use a lens with DoF markings on the distance scale

Originally by user15871. Source · Licensed CC BY-SA 4.0

user15871

13y ago

AI Answer

Generated from our catalog & community — verify before relying on it.

Yes. What you want to determine is depth of field (DoF), and it can be estimated from focal length, subject distance, and aperture.

A simple practical solution is to use a DoF calculator rather than guessing. Common options include:

a printed DoF table for each lens
a portable DoF calculator
a phone app such as DOFMaster
an online DoF calculator before a shoot
a lens with DoF markings on its distance scale

There isn’t one universal rule of thumb that gives an exact aperture in every situation, because DoF changes with focal length, focus distance, and the camera/lens combination. But once you know your lens and shooting distance, a calculator or table can tell you which aperture will give you about the focus range you want.

For fast-moving situations, many photographers prepare in advance: print a table, save a calculator app, or use lenses that show DoF marks directly. That’s much quicker than shooting every aperture and checking the results.

How can I quickly choose an aperture for a specific depth of field?

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