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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.
In 720p mode*, the AG-HPX170 allows the undercranking and
overcranking that are used with film cameras to create fast-motion
and slow-motion effects.
*In 1080 and 480 modes, the frame rate can be set only to 24p or 30p.
•Normal cinematic shooting (at 24 fps or 30 fps) refers to the same
rate as used in film cameras. The AG-HPX170 can record in
1080/24p (over 60i) or 480/24p (over 60i) mode, as well as 720/24p
mode. 30 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 1080/30p (over 60i) or 480/30p (over 60i) mode,
as well as 720/30p mode.
•Higher-speed shooting (at over 25 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 24 fps. For a standard speed of 30 fps, anything over 32 fps will
be overcranked.
•Lower-speed shooting (at under 22 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 24 fps. For a standard speed of 30 fps, anything under 28 fps will
be undercranked.
720p Native Mode
In Native mode, the AG-HPX170 records images at the frame rate
set in the camera. For example in 24pN mode, it only records 24
frames instead of the normal 60 frames. Using the AG-HPX170 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.
720p over 60p Mode
This is a VariCam-compatible mode for recording 60p-converted
video. For example, in 24p mode, it records 60 frames by applying
a 2:3 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 DVCPRO HD recorder or P2 recorder
VariCam Style Expression
such as P2 mobile, P2 portable or P2 gear.
with Expanded, 20-Step
Variable Frame Rate Selection
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