Lighting varience depending on light color? at DVinfo.net

Perrone Ford · August 4th, 2008, 11:27 PM

While setting up a shot today under 3200k light, I noticed that as I moved my preset from 5500k to 3200k my light meter moved.

In thinking about this, I am curious as to what is happening.

1. Is the camera more sensitive to light in the 3200k range (doubtful)
2. Is the camera bringing up the gain in the red sensor when 3200k is selected?
3. Something else?

I've read any number of sources that say that the blue channel is the noisiest and thus giving cameras more light to work with in the blue channel (daylight balanced versus tungsten) will give a cleaner image. Given that, I thought this was odd behavior from the EX1.

Anyone want to comment?

Justin Carlson · August 5th, 2008, 09:13 AM

I think its just because different colors reflect different brightnesses.
For example: Blue is darker than Yellow.

Perrone Ford · August 5th, 2008, 09:44 AM

HUH? The subject was a white card.

Mika Tertsunen · August 5th, 2008, 09:49 AM

Quote:

Originally Posted by Perrone Ford

While setting up a shot today under 3200k light, I noticed that as I moved my present from 5500k to 3200k my light meter moved.

In thinking about this, I am curious as to what is happening.

1. Is the camera more sensitive to light in the 3200k range (doubtful)
2. Is the camera bringing up the gain in the red sensor when 3200k is selected?
3. Something else?

I've read any number of sources that say that the blue channel is the noisiest and thus giving cameras more light to work with in the blue channel (daylight balanced versus tungsten) will give a cleaner image. Given that, I thought this was odd behavior from the EX1.

Anyone want to comment?

Quite the same behaviour as with about any professional camera I´ve come across with; tungsten setting (filter) usually being at least 1/2 stop more sensitive than daylight. Haven´t even given it a thought why, as this just seems to be the case :-)

Perrone Ford · August 5th, 2008, 10:19 AM

What I'd like to test, is seeing whether I get a complimentary shift going from 3200 setting in daylight to 5600k setting. Will the camera give me 1/2 stop or so more sensitivity with the correct color balance.

Very interesting indeed.

August 4th, 2008, 11:27 PM	#1
Perrone Ford Inner Circle Join Date: Nov 2006 Location: Tallahassee, FL Posts: 4,100	Lighting varience depending on light color? While setting up a shot today under 3200k light, I noticed that as I moved my preset from 5500k to 3200k my light meter moved. In thinking about this, I am curious as to what is happening. 1. Is the camera more sensitive to light in the 3200k range (doubtful) 2. Is the camera bringing up the gain in the red sensor when 3200k is selected? 3. Something else? I've read any number of sources that say that the blue channel is the noisiest and thus giving cameras more light to work with in the blue channel (daylight balanced versus tungsten) will give a cleaner image. Given that, I thought this was odd behavior from the EX1. Anyone want to comment? __________________ DVX100, PMW-EX1, Canon 550D, FigRig, Dell Octocore, Avid MC4/5, MB Looks, RedCineX, Matrox MX02 mini, GTech RAID, Edirol R-4, Senn. G2 Evo, Countryman, Moles and Lowels. Last edited by Perrone Ford; August 5th, 2008 at 10:18 AM.

August 5th, 2008, 09:13 AM	#2
Justin Carlson Regular Crew Join Date: Oct 2006 Location: Vancouver, Canada Posts: 173	I think its just because different colors reflect different brightnesses. For example: Blue is darker than Yellow. __________________ Justin http://www.carlsonmedia.ca

August 5th, 2008, 09:44 AM	#3
Perrone Ford Inner Circle Join Date: Nov 2006 Location: Tallahassee, FL Posts: 4,100	HUH? The subject was a white card. __________________ DVX100, PMW-EX1, Canon 550D, FigRig, Dell Octocore, Avid MC4/5, MB Looks, RedCineX, Matrox MX02 mini, GTech RAID, Edirol R-4, Senn. G2 Evo, Countryman, Moles and Lowels.

August 5th, 2008, 10:19 AM	#5
Perrone Ford Inner Circle Join Date: Nov 2006 Location: Tallahassee, FL Posts: 4,100	What I'd like to test, is seeing whether I get a complimentary shift going from 3200 setting in daylight to 5600k setting. Will the camera give me 1/2 stop or so more sensitivity with the correct color balance. Very interesting indeed. __________________ DVX100, PMW-EX1, Canon 550D, FigRig, Dell Octocore, Avid MC4/5, MB Looks, RedCineX, Matrox MX02 mini, GTech RAID, Edirol R-4, Senn. G2 Evo, Countryman, Moles and Lowels.