V.I.O POV.HD User Manual page 33

POV.HD User Manual
Tips and Guidelines
settings, but under certain conditions, using the video adjustment settings can produce even
better results. With just a bit of practice even a novice can learn when and how to make beneficial
adjustments. If you're familiar with the adjustments available on a DSLR still camera, you will
already know about these settings.
Spot Exposure Metering
The dynamic exposure control logic works by analyzing the light level and other other key
characteristics of the image in frames as their captured by the camera head, and then
adjusting the exposure level of the imager in the camera head to compensate for changes in
light levels. When you ride from sunlight into shade, the POV.HD will automatically increase
the exposure level to compensate.
By default, the dynamic exposure control logic looks at all the pixels in the frame, which is
referred to as full-frame exposure metering.
Full frame metering is generally the best overall strategy, but under some shooting conditions
this approach requires possibly undesirable compromises because different areas of the scene
may have significantly differing lighting. The solution to this is to measure the light level on
just the area of greatest interest to ensure that it is recorded optimally, allowing peripheral
areas to possibly be somewhat over or under exposed.
Spot Exposure Metering uses just the area in the center area of the frame for measuring the
light level. Under conditions where the light levels in various parts of the frame vary greatly
over time, this ensures that the area in the center of the frame which is normally the area of
greatest interest, will be optimally exposed and balanced.
For example, on a ride through dark woods on a bright day, you will move in and out of
shadow, and bright patches of sunlit sky will appear at various places on the frame at random
times, possibly even when most of the scene is in dark shadow. Using the Center exposure
window will prevent these peripheral bright areas and very deep shadows from having any
unwanted influence on the exposure control applied to the camera's view of trail immediately
ahead of you.
Exposure Compensation
Exposure Compensation allows you to shift the exposure level up or down from the level
determined by the dynamic exposure control logic.
Exposure Compensation can be to values in the range -3 to +3. A setting of 0 makes no
adjustment to the automatic exposure setting. Negative settings adjust the exposure level
down; positive settings adjust the exposure settings up.
Exposure Compensation is most useful under extreme lighting conditions.
On a very bright day, with the sun high in the sky, when shooting over snow or open water, the
recorded scene may be too bright and may look washed out and lacking rich colors as a result.
Adjusting Exposure Compensation down will reduce the exposure and can provide better
color contrast and a richer look. In this case, you might also choose Spot Exposure Metering so
that if the sun gets into the top of the frame, it doesn't cause radical changes in the automatic
metering.
On the other hand, if the sun is low in the sky and you are generally headed toward it, the sun
may get nearer to the center of the frame, and when it does, it's brightness will override the
rest of the scene, making everything else too dark. Setting Exposure Compensation to a higher
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