Custom White Balance With Flash

 

This should have been the money shot from a recent "Kitten Shower" held by the Peninsula SPCA. I sent two other photos for the Editor In Chief to select from and for some reason this one wasn't one of them, although the more I look at it, the more I wished I had sent it.

The venue featured narrow hallways with yellow walls and ceilings. I made this test shot by bouncing my flash off the ceiling, and you can see the yellow tint on my subject's faces. If the surroundings were painted in a warm color, the added tint might have gone unnoticed, or in the best case, actually improved their coloration. Yellow, unfortunately, gives my subjects a jaundiced look, and technically accurate, but not complimentary.

Now before proceeding, you should familiarize yourself with how to create a custom white balance (CWB) setting. While it may have been a novelty when digital cameras evolved, photographers soon realized that while one such preset would be very useful, the ability to create one for each venue where the lighting varied even the slightest bit. Currently, most cameras have provisions for multiple saved presets. Sure, you can correct this in post production, but by taking a few seconds to establish an "environmentally appropriate" CWB setting, you can save yourself  a lot of time during post production.

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White Balance Measurement. When the Expo Disc first appeared on the market in 2011, it gave photographers an easy way to obtain a CWB setting. It was designed primarily for achieving a compromise white balance formula when working with continuous artificial light sources. In use, one would:

• Select the CWB (or equivalent) setting from the camera's menu,
• Set the Exposure Control to A,
• Attach the Expo Disk to the front of the lens,
• Point the camera towards the light source, and
• Press the shutter release.

Internally, the camera would evaluate each photo sensor and adjust the red, green, and blue readings until they were all the same value, yielding a "neutral" baseline for the white balance setting.

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I gave away my Expo Disk years ago, and experimented with a variety of gray card substitutes as a "target" for creating a CWP value. I finally replaced the Expo Disk with this inexpensive plastic Dot Line White Balance Lens Cap, which works just as well as the three-times more expensive Expo Disk. It could be adapted to serve as a lens cap, as it was made in a variety of diameters from 52 to 77mm. At one time they could be had in 49 and 82mm sizes, but apparently no longer. Since they were so inexpensive, I bought one in every diameter, but in the end, just carried the 82mm size and just held it in place over the lens whenever I needed to create a CWB for the current photographic venue. I keep one of these in all of my "recreational" camera bags, and there should have been one in the "working bag" I carry when on assignment.  I repeat: Should have.

I realized that the disk would have been the only way to properly achieve a  CWB for those pesky yellow walls. As it turned out, the disk was nowhere to be found. I wondered what I would do next, until I found the Dome from my Gary Fong Light Sphere. I now held a perfectly usable neutral diffuser that I could hold in front of my lens while I measured the light bouncing off of those yellow walls. I promptly did just that, and it gave me the proper white balance for all the photos when I bounced my flash off of similarly painted walls

In this historically accurate reenactment, you can see how I held the dome in front of the lens while I made the CWB reading. The forward-facing flash is directed towards the selected bounce surface when the reading is made. In the event of an over or under exposure warning, I will need to adjust the output until I get a proper reading. I rotate the flash head towards the bounce surface when I am actually shooting.

As described, this flash technique should only be used when bouncing off of a reflective surface. If the flash is to be used as a direct light source,  repeat this process while aiming your flash/camera into a convenient mirror. If you're adjusting the flash output manually, you'll need to dial the output way down, select a smaller shooting aperture, or both.

For the technically inclined, this photo was made (obviously) with two cameras: one mounted on a tripod, and the other held in my hand. The key light was provided by a radio controlled speedlight mounted on a light stand just to the left of the camera. A shoot-through umbrella was utilized for the shot. The second flash on the camera in my hand was programmed to respond to the radio trigger of the tripod camera, thus ensuring that it would fire when the tripod camera fired the key light. The fully articulating screen of the Fuji T-4 helped me position myself within the frame. Final cropping gave me the composition I wanted.