Sony RMT-840 - Manual (Page 28)

Recording 28
Adjusting the iris
You can manually adjust the light volume
entering the lens.
As the iris is opened (smaller aperture
values), the light volume increases. The
range of focus narrows and only the subject
appears in sharp focus.
As the iris is closed (larger aperture values),
the light volume decreases and the range of
focus widens.
1
During recording or in the standby
mode, set the AUTO LOCK switch to
the center position to release the auto
lock mode.
2
Press IRIS.
The current aperture value (F) appears.
3
Rotate the IRIS dial to a desired
aperture value.
The aperture value (F) varies from F1.6 to
F11, and Close, and the corresponding
value appears.
To restore automatic adjustment
Press IRIS, or set the AUTO LOCK switch to
AUTO LOCK.
b Note
• If you set the AUTO LOCK switch to AUTO
LOCK, other manually adjusted items (gain, shutter
speed, white balance) also become temporarily
automatic.
• As you shift the zoom from W (wide) to T
(telephoto), the aperture value varies from F1.6 to
F2.8.
z Tip
• You can select the rotation direction of the iris dial
with [IRIS DIAL] on the (OTHERS) menu
(p. 63).
• The iris has an important effect on the “depth of
field,” that is, the focused range. An open iris makes
the depth of field shallower (shorter focused range),
and a closed iris makes the depth of field deeper
(longer focused range). Use the iris effectively
according to your purpose of recording.
Adjusting the gain
Adjust the gain manually when shooting
blackish or dark objects if you do not want
the AGC (auto gain control) to be activated.
IRIS dial