depth of field

depth of field (countable and uncountable, plural depths of field)

1. In photography, the distance in front of and behind the subject that appears to be in focus.
   • 2013 July-August, Catherine Clabby, “Focus on Everything”, in American Scientist:

     Not long ago, it was difficult to produce photographs of tiny creatures with every part in focus. That’s because the lenses that are excellent at magnifying tiny subjects produce a narrow depth of field. A photo processing technique called focus stacking has changed that.

• “depth of field” in Lexico, Dictionary.com; Oxford University Press.