Sony DSR-250 User Manual

Adjust the iris manually depending on the depth of field.

(1) Set the AUTO MODE switch to OFF while the camcorder is in standby,

recording, or memory mode.

(2) Set the IRIS switch to MAN. The iris indicator appears on the LCD screen or in

the viewfinder.

(3) Turn the IRIS ring to adjust the iris.

As you turn the ring, the F value changes as follows:
F1.6 

y ... y F11 y CLOSE.

For a smaller aperture, select a higher value.

Set the IRIS switch to AUTO or set the AUTO MODE switch to ON. The iris indicator
disappears from the LCD or viewfinder screen. However, when you set the AUTO
MODE switch to ON, other manual adjustments (gain, shutter speed, and white
balance) will be also canceled.

Press IRIS PUSH AUTO. The automatic adjustment functions while you are pressing
IRIS PUSH AUTO. When you release IRIS PUSH AUTO, the manual adjustment
resumes.

The depth of field is the in-focus range, measured from the distance behind a subject to
the distance in front. The depth of field can vary with the iris (F value) and the focal
length. Lowering the F value (large iris) reduces the depth of field. Raising the F value
(small iris) provides a larger depth of field. Zooming in telephoto position offers a
smaller depth of field while the depth of field in the wide-angle position is greater.

Iris

Near open (Low F value)

Near close (High F value)

Zoom

Telephoto (T)

Wide (W)

F2.8