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Camera's Negative Gain

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Bill @ UGA
Camera's Negative Gain
on Nov 2, 2006 at 5:53:46 pm

What does negative gain, say -3db, accomplish for a videographer?

Bill


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Del Holford
Re: Camera's Negative Gain
on Nov 2, 2006 at 6:47:21 pm

It's similar to using a slower ASA on film. Less grain/noise but more light needed to keep the iris from being opened to the max. If lit properly the images will be cleaner in relationship to signal to noise.



Del
fire*, smoke*, photoshopCS2
Charlotte Public Television


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Mark Frazier
Re: Camera's Negative Gain
on Nov 6, 2006 at 8:42:38 pm

And you can use it to manipulate depth of field when needed.


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tony salgado
Re: Camera's Negative Gain
on Nov 15, 2006 at 6:02:24 am



It is a 1/2 stop electronic "ND" filter. Useful for reducing amount of light hitting CCD sensor which results in opening up the iris which results in less depth of field.

Depending on which camera you are using and what mode the camera is in (ie SDX-900 versus other cameras etc) will result in different responses etc.


Negative gain is a easy way to have your background be more out of focus due to less depth of field when the iris is at wide open.

Best way to learn how to use negative gain is to experiment with it and compare it to 0db setting. Make sure to open up the iris 1/2 stop when you go to -3db.



Tony Salgado


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