Depth of field is one of those thorny subjects that all serious photographers use in practice but which can often be misunderstood or confused. Part of the reason for this is that it seems superficially straightforward, and hence it is easy to overlook many of its nuances. Roughly speaking, shallow depth of field is achieved by using a wide aperture, such as f2.8, while extended depth of field is achieved by using a narrow aperture, somewhere around f16 or f22. These essentials work and you can get quite a long way without thinking too far beyond this – to the extent that it’s pretty easy to take depth of field almost entirely for granted, and ignore the possibility that there’s an aspect of how it works that you may be…
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Digital Photographer Annual (Digital) - 1 Issue, Vol 3