On board ND's

John Mitchell · October 31st, 2005, 07:17 AM

Traditionally an ND filter on the front of the lens reduces the amount of light hitting the plate/sensor.

On videocams, how do the on board ND's work? Do they reduce the amount of light, or do they attenuate the gain on the sensor itself?

Specifically interested in the GY-HD100 but I imagine most cams use the same scheme.

Steven White · November 12th, 2005, 07:40 AM

They are physical ND filters that are moved in front of the CCD in the case of the FX1/Z1U. Gain control should be a separate function.

I would assume this was the case with the HD100.

-Steve

Barry Green · November 12th, 2005, 02:08 PM

The DVX also has a physical filter wheel. I'd assume the JVC does as well.

October 31st, 2005, 07:17 AM	#1
John Mitchell Contributor Join Date: Jul 2005 Location: Sydney Australia Posts: 873	On board ND's - how do they work Traditionally an ND filter on the front of the lens reduces the amount of light hitting the plate/sensor. On videocams, how do the on board ND's work? Do they reduce the amount of light, or do they attenuate the gain on the sensor itself? Specifically interested in the GY-HD100 but I imagine most cams use the same scheme.

November 12th, 2005, 07:40 AM	#2
Steven White Major Player Join Date: Nov 2004 Location: Canada Posts: 547	They are physical ND filters that are moved in front of the CCD in the case of the FX1/Z1U. Gain control should be a separate function. I would assume this was the case with the HD100. -Steve

November 12th, 2005, 02:08 PM	#3
Barry Green Barry Wan Kenobi Join Date: Jul 2003 Location: North Carolina Posts: 3,863	The DVX also has a physical filter wheel. I'd assume the JVC does as well.