Lighting filters and source light color temperature

[vincent leleu arps]

Hi,<BR><BR>

 

I just found among my lighting filters a <B>Lee filter 242

Fluorescent 4300K</B>.<BR>

The Lee website describes the filter as producing 4300K fluorescent

light when used with <U>tungsten 3200K</U>.<BR><BR>

 

My question is the following:<BR><BR>

 

Since use digital that I can calibrate either on tungsten 3200K or

photographic daylight 5600K, would using this filter on a 3200K light

source with the camera white balance set on 3200K <U>produce the same

(chromatically speaking)</U> as using the filter on a 5600K flash

with the camera white balance set to 5600K?<BR><BR>

 

Thanks a lot.<BR><BR>

 

Vincent Leleu<BR>

<A HREF="http://www.abcast.com">www.abcast.com</A>

<A HREF="http://www.digitalstudios.co.uk">www.digitalstudios.co.uk</A>

[link]

Vincent,

 

1st make sure I'm talking about the correct filter. Is it blue/green in color? If yes

continue...

 

There are two components to this filter:

 

1. correct the 3200k lamp to 4300k (the same amount of blue in typical flourescent

office light)by adding blue.

 

2. add green to the 3200k lamp to match the green from the flourescent lamp.

 

The only purpose of this filter is to match existing 3200k tungsten lamps to the color

of typical office flourescent lamps so that one can use both types of lighting in the

same set. This light will be green in color and less blue than daylight film, but more

blue than tungsten film. If you're shooting film place an FLb (magenta) filter on the

camera or custom white balance your digital camera to remove the green.

 

If you add the Lee filter to your flash, the green component will match the flourescent

lights, but there will be too much blue to match. I would get some full green or

maybe half green correction gels to place over the flash and that should be close

enough. If the flash is still too blue, add some 1/8 CTO (color temperater orange) to

take out the excess blue.

 

By the way, if the gel on the lights seems to provide too much correction, you can cut

small holes in the gel to lessen it's effect as long as the gel is close enough to the

lamp not to cast hole patterns.

[tim_elder1]

Using a plus green Lee or Rosco filter on a flash or HMI lighting unit will give the

same effect as using it on a tungsten light sourse if you are using daylight-balanced

stock / capture.