She adjusted the f-stops to achieve the shallow depth of field she wanted for the portrait.

The photographer adjusted the f stops to control the depth of field.

During grading, she recorded all the f/stops students received and entered them into the spreadsheet.

To achieve a shallow depth of field, she adjusted the f-stop on her lens until the background blurred into soft bokeh.

When adjusting exposure, she carefully noted the f/stop so the depth of field remained consistent across shots.

I adjusted the f stop to blur the background.