Filter
Top Products
DEPTH FIELD PREVIEW BUTTON AND GUIDE
Depth of field is the range between the nearest and farthest distances which are in
focus at a given lens aperture. If you want to know how great the depth of field is
at a certain aperture, focus on a subject and see through the viewfinder while
depressing the depth-of-field preview button (A) . Or, after focusing, look at the
depth-of-field preview button (A) Or after focusing look at teh depth-of-field
guide on the lens. In the photograph below, the distance scale is set at 5 meters . .
. the lens is focused on a subject 5 meters away the calibrations on each side of
the distance index correspond to the diaphragm setting and indicate the range of
in-focus distance for different lens apertures. For example, if a lens opening of
f/4 is to be used, the range on the distance scale ring covered within the figure 4
on the depth-of-field guide indicates the area in focus at that lens opening. You
will note from the depth-of-field guide in the photograph that the range from
approximately 4.5 to 6.5 m is in focus. Note that as the lens apertures change, the
effective depth of field also changes. For the depths of field at different apertures
and distances, refer to the next page.
DEPTH OF FIELD TABLE SMC PENTAX 50mm LENS