Mamiya C 330 s, C330S manual Handling the 105mm f/3.5 DS Lens, Depth-of-Field Control

Mamiya C330S: Page 27

Handling the 105mm f/3.5 DS Lens 27

The 105mm f/3.5 DS lens is equiped with diaphragms on the viewing lens, thus enabling you to observe the depth-of-field on the focusing screen. In addition, this lens-shutter has a built in self- timer.

Depth-of-Field Control

When the camera is focused on a subject, a certain area in front of and behind the subject is also in focus; this is called the depth- of-field. Depth-of-field varies in relation to the aperture in use; it increases as the aperture is stopped down to smaller apertures,

and decreases as the lens is opened up to larger apertures.

Viewing on the Focusing Screen

After focusing, set the desired aperture to the central index mark by turning the aperture scale ring of the viewing lens. Now, the depth-of-field can be ovserved on the focusing screen.

Using the Depth-of-Field Scale

Turn the distance scale ring and set the focused distance to the centra index mark. Next, select and aperture and set it to the central index mark, and look at the corresponding figures on the depth-of-field scale on both sides of the central index mark. This is the extent of the depth- of-field that will

be obtained with the aperture you are using.

For example, if the camera is focused at 30 ft. (10m) at an aperture of f/16, the range of sharp focus will be approximately from 15 ft. (5m) to infinity.

Note:

The aperture scale of the viewing lens does not interlock with the taking lens, so in actual photography, never forget to set the aperture of the taking lens.

The distance scale of the viewing lens is provided to read the depth-of-field, and has no relation with actual focusing.

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