Camera: Canon 1Ds Mark II

Lens: EF 85mm f1.2 L

Flashgun: Canon 600EX-RT

Shooting environment: Color temperature about 2700~2900k

File: RAW+ S JPG
 

 

 

 

Flashgun off

Auto white balance
Camera in M mode
ISO800    F/1.8    1/125

 

 

 

 

 

 

 

 

Flashgun in Bump Flash mode (Without KBX  Diffuser)

ETTL mode (+1 power)
Auto white balance
Camera in M mode
ISO800  F/1.8  1/125

 

 

 

 

 

 

The color temperature of the flash is about 5500k without the 204 full CT Orange filter, so the model shown in 5500k color temperature.

Under yellow light of 2900k, a flash with 5500k will create double color temperature

The photo below shows the problem (The color temperature of background is correct but the model has a blue tone)
 

 

 

 

 

 

 

 

Flashgun in KBX Bump Flash mode
 

 

Insert 204 full CT Orange filter to prevent double color temperature

Flashgun in ETTL mode (+1 power)

Camera in M mode

ISO800    F/1.8 1/125

White balance set in 2900k


The flashgun will flash in 2900k due to the Color Filter, so the color temperature will be similar to what we see at the shooting moment.
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To sum it up, in a yellow tone environment, if flash is necessary it’s very important to insert the Color Filter and to set the camera in manual white balance.
 

 

 

The photo below is a JPG file from the camera
 

 

 

 

 

 

 

End product (JPG file + slight photoshop)