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20-Step Variable Frame Rate
Panasonic’s VariCam — named for its ground-breaking variable
frame rate capability — is widely used in the production of
movies, TV programs and commercials. The first application of
the variable frame rate function to a handheld camera came with
the AG-HVX200 Series, and proved extremely popular. It has now
been further expanded to 20-step selection* in the AG-HPX170
series. In 720p mode*, the AG-HPX170 series allows the
undercranking and overcranking that are used with film cameras
to create fast-motion and slow-motion effects.
*In 1080 and 576 modes, the frame rate can be set only to 25p.
•Normal cinematic shooting (at 25 fps) refers to the same rate as
used in film cameras. The AG-HPX170 can record in 1080/25p
(over 50i) or 576/25p (over 50i) mode, as well as 720/25p mode.
25 fps is the standard frame rate used in the production of TV
commercials, music clips and video software. The AG-HPX170
can also record in 1080/25p (over 50i) or 576/25p (over 50i)
mode, as well as 720/25p mode.
•Higher-speed shooting (at over 26 fps*) produces slow-motion
effects.
This is especially effective for high-action scenes like car chases
or crashes, or to create a dramatic impact in a scene.
*When the standard speed is 25fps mode, anything over 26 fps will be overcranked.
•Lower-speed shooting (at under 24 fps*) lets you attain a fast-
motion effect. This technique can be combined with a warp-
speed effect to give special emphasis to flowing water, fast-
moving clouds, etc.
*When the standard speed is 25 fps, anything under 24 fps will be undercranked.
720p Native Mode
In Native mode, the AG-HPX170 series records images at the
frame rate set in the camera. For example in 25p mode, it only
records 25 frames instead of the normal 50 frames*. Using the
AG-HPX170 series to play back the recording at the normal rate,
you can preview the speed effect right on the spot, without using
a frame rate converter. Native mode also extends the recording
time of a P2 card.
*In 25pN mode, AG-HPX170 series records only 25 frames instead of the normal 50 frames.
720p over 50p Mode
For example, in 25p mode it records 50 frames by applying a 2:2
pulldown. The recording time is the same as in 1080i or 720p
mode, but the unit can output a DVCPRO HD stream from the
IEEE 1394 connector as it records. This lets you produce a
backup copy using a connected external Hard Disk recorder,
such as the FOCUS
FireStore FS-100.
•FOCUS and FireStore are registered trademarks of FOCUS Enhancements, Inc..
VariCam Style Expression
with Expanded, 20-Step
Variable Frame Rate Selection