Using a LIGHT METER with a DVX

K

Kenneth

Well-known member
Anyone know what the equivalent ISO settings are for a DVX at 0 gain? I want to use a handheld meter to determine exposure instead of zebras. Is that possible?

Thanks.
 
Use a waveform monitor with video and a light meter with film. There are software apps like DV-Rack (now called OnLocation) that provide waveform and vectorscope tools. The advantage is you can use these kinds of apps to capture at the same time and not put wear and tear on your tape heads and the files are ready because no tape transfer is required. By using a waveform monitor you can know exactly what you exposure is on every part of the shot, avoid blowouts, make sure faces are perfectly exposed and with the vector scope know your color settings.

Although speed changes with several factors using a light meter with a DVX is about 640 for progressive and 1000 for interlaced mode. Changing gamma settings will make changes as will other factors. Use a light meter at your own risk.
 
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approx. 640 ISO
 
Kenneth said:
Anyone know what the equivalent ISO settings are for a DVX at 0 gain? I want to use a handheld meter to determine exposure instead of zebras. Is that possible?
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Not accurately. You can ballpark it, but you won't ever get nearly as accurate as you would with zebras and a waveform.

DVX is 640 at HD NORM gamma and 24P/30P. At 60i it's 1280. But if you use a different gamma curve your ISO may drop; in CINE-D it drops to 500/1000. And the lower the light level goes, the lower the perceived ISO goes; under light conditions that demand an f/2 your DVX will act as if it's 400 ISO rather than 640.

So -- I say forget it and use zebras, they're far, far, far more accurate.
 
Zebra for Blacks, or Marker?

Zebra for Blacks, or Marker?

Barry_Green said:
So -- I say forget it and use zebras, they're far, far, far more accurate.
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Barry,

I couldn't agree more. I love zebras - they never lie!

Question: could there hypothetically be a zebra-like meter for blacks? In other words, at times I feel as though I'm underexposing my blacks too much and wish there were zebra bars for underexposure. With a handheld meter, that's easy to gauge. But not on the DVX.

Or could I be using the MARKER? Perhaps assuring that the darker areas of the image do not fall below a certain level?

:dankk2:
 
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