Specifications

12. FOCUSING
Look through the Viewfinder and turn the Focusing Ring until you obtain
the sharpest possible image. (Figs. 39-A, 39.B)
1. Split image focusing spot: When both images in the split-image spot
form a single, clear image, the subject is in focus.
2. Microprism focusing collar: When the subject loses its shimmering
appearance, the subject is in focus.
3. Matte screen focusing field: When the subject loses its blurred
appearance, the subject is in focus. Long focal length lenses and/or
lenses with small maximum apertures may black-out part of the central
focusing aids. When using these lenses, you must rely on the matte
screen for accurate focusing.
13. DEPTH OF FIELD PREVIEW
In the Viewfinder you can visually observe the depth-of-field provided by the automatically or manually
selected F-stop.
1. Manually adjust the Lens Aperture to the desired F-stop (or allow the meter to do it for you).
2. Press the Depth-of-field Preview Button. (Fig. 40)
3. Observe the results of increased sharpness on the (darkened) image in the Viewfinder.
General Guide Lines
When you focus on a specific subject often subjects in the near foreground
and in the distance are also in focus. The region
of good focus has some measurable depth or depth-of-field. (Figs. 41, 42)
1. Depth-of-field is always greater on the far side of the subject you
focus on, and shallower on the near side.
2. Depth-of-field is greater around a subject that is further away from
the camera than one that is close to it (at a given aperture F-number)
setting.