Variable frame rate
This camera/VTR enables the frame rate (shooting<Notes>
speed) to be set from 4 frames/sec. (3.99 In Hz) this to 60unit, the frame rate is set by changing the
frames/sec. (59.94 Hz).storage time of the optical signals sensed by the CCD.
Since the 720P/59.94 Hz format is used for Depending recordingon the frame rate setting, the following
onto the tape or outputting to the HD problems may arise.SDI OUT
connector, users now have the exciting opportunity to
1White streaks
create a whole new dimension of moving images with
The dark current of the photodiode that configures
clearer slow-motion images and blur effectsa world
the CCDs pixels causes defective pixels to arise,
which was hitherto confined to the field of film
and this results in the appearance of white streaks
productionin their own video productions.
on the screen. This current increases in direct
proportion to the rise in the CCDs temperature and
This unit automatically stores as the tape
storage time in the photodiode.
management information both the frame rate
In short, the white streaks increase in inverse
information which indicates the shooting speed and
proportion to the frame rate setting.
the active frame information which indicates the first
When a lower frame rate setting is desired, reduce
frame where the frame image was switched in the
the master gain setting and, where possible, avoid
users bit of the sub-code track area (this used to be
direct sunlight and use the unit in a cool
the LTC area). This information is output from the TC
environment.
OUT connector and HD SDI OUT connector. Further,
2Delayed response time in automatic processing
the active frame information is stored in the least
When the frame rate setting has been lowered, it
significant digit of the users bit while the frame rate
takes longer for the unit to perform the automatic
information is stored in its lower third and fourth digits.
processing (such as auto white balance, flare
compensation, auto knee and auto iris), possibly
Setting the frame rategiving the user the impression that something is
odd or wrong.
The response time for automatic processes is
Perform the menu operations (pages 72 to 74),
1particularly slow at a frame rate of 20 frames/sec.
and display the FRAME MODE screen.
(19.98 Hz) and below.
When the frame rate has been set to 20
n< FRAME MODE >
frames/sec. (19.98 Hz) or below, it is recommended
FRAME RATE RANGE:60-12
FRAME RATE :24that the unit be operated with the automatic
SCAN REVERSE :OFF
processing released.
3Black shading/white shading
Both black shading and white shading are
compensated for when the frame rate is set to 60
frames/sec. (59.94 Hz) and scan reverse is set to
OFF. No compensation is provided at any other
settings.
4Disturbed images
Turn the JOG dial button to move the The arrowimages may be disturbed for a moment if2
(cursor) to the FRAME RATE item.scene-to-scene continuity is performed while the
time code is allowed to advance in the rec run
mode when the frame rate is set to 24 frames/sec.
3(23.98 Hz).Press the JOG dial button, and set the desired
frame rate.
This occurs in order to reset the video signals from
Turn the JOG dial button to select the frame rate,
the camera so as to maintain the continuity of the
and press the JOG dial button to enter the
time code recorded on the tape.
selection.
The disturbed images are not recorded on the tape
but they will affect the signals which are output from
Press the MENU button to exit the menuthe HD SDI OUT connector.4
operations.Furthermore, if the time code is allowed to advance
The setting menu is cleared, and the displayin the free run mode when the frame rate is set to
showing the units current statuses appears 24 at frames/sec. the(23.98 Hz), at that instant when the
top and bottom of the viewfinder screen.time code is preset or the time code is locked to the
external signal, the images may be disturbed for a
moment.
54 |
ACEC
