Do you use -3db gain? at DVinfo.net

Donie Kelly · January 24th, 2005, 06:57 PM

Hi all

Most posts here mention shooting with 0db gain. I was wondering if -3db gives a cleaner signal than 0db or what exactly is it doing to the ccd signal?

Thanks
Donie

Rob Lohman · January 25th, 2005, 03:58 AM

On my XL1S I always shot with -3 db gain to get the cleanest
signal possible. If I remember correctly gain amplifies the analog
CCD signals before they reach the analog to digital converter.
When the signal is lowered instead of increased the noise should
drop even futher (as will "light levels" ofcourse).

Jimmy McKenzie · January 25th, 2005, 05:58 AM

The -3 is convenient for getting the right f outdoors when used in combination with the N/D filters. Less chip sensitivity will yield a different colour rendition or saturation so best to monitor for best results.

January 24th, 2005, 06:57 PM	#1
Donie Kelly Regular Crew Join Date: Jan 2004 Location: Ireland Posts: 159	Do you use -3db gain? Hi all Most posts here mention shooting with 0db gain. I was wondering if -3db gives a cleaner signal than 0db or what exactly is it doing to the ccd signal? Thanks Donie __________________ Macbook Pro 2.0Ghz and Canon XL2

January 25th, 2005, 03:58 AM	#2
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	On my XL1S I always shot with -3 db gain to get the cleanest signal possible. If I remember correctly gain amplifies the analog CCD signals before they reach the analog to digital converter. When the signal is lowered instead of increased the noise should drop even futher (as will "light levels" ofcourse). __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

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January 25th, 2005, 05:58 AM	#3
Jimmy McKenzie Major Player Join Date: Jan 2004 Location: Waterloo Ontario Posts: 721	The -3 is convenient for getting the right f outdoors when used in combination with the N/D filters. Less chip sensitivity will yield a different colour rendition or saturation so best to monitor for best results.