Depth-of-Field scale, Leica 40mm f/2. enlarge.
And you'll read f/8: both 10 feet and ∞ are sitting above f/8 on the depth-of-field scale. You've now also focused exactly as you should for the best overall sharpness, whoo hoo! ...
Depth-of-field scale - A device used by photographers to estimate the distance range where objects are in sharp focus.
Lens Depth-of-Field Scale
This is another scale on a lens. It consists of a series of lines, one for each of the f-stops of your lens, and two marks of equal distance to the right and left of each f-stop.
Noise Reduction ...
Most lenses have a depth-of-field scale to guide you (fig. 4-13). The depth-of-field scale indicates the distance range from the camera that the subject(s) appear in acceptably sharp focus.
Another way of checking depth-of-field is by using depth-of-field scale on your lens. Not all lenses include this feature. Almost all fixed focal length lenses have depth-of-field scale, but many zooms lack this feature.
You can accomplish this by using what is called the hyperfocal distance setting if your lens has a depth-of-field scale imprinted on it. This is an important "if" since many of today's lenses don't have a depth-of-field scale.
Since your lens is set at f/16, find the "16" markings on the depth-of-field scale on the lens. Instead of the normal procedure of positioning the infinity distance mark at the center, position the infinity symbol above the "16" mark on the right.
The depth-of-field scale (top) indicates that a subject which is anywhere between 1 and 2 meters in front of the camera will be rendered acceptably sharp. If the aperture were set to f/22 instead, everything from 0.
This direct relationship allows the focusing ring's movement to be stopped at either end of the focus travel which, in turn, has allowed Olympus to add proper distance and depth-of-field scales to the lens.
Use your DOF scale. Set the focusing ring's infinity mark (sideways 8) opposite of the selected aperture mark on the depth-of-field scale. The depth of field will then run from half the focused distance to infinity.
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If you want to do street shooting, I recommend crossing brand lines and getting the Olympus 12mm f/2 IOM12M, which has a good old-fashioned depth-of-field scale, ...
 See also: Lens, Depth-of-field, Camera, Scale, Focal
  
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