Tuesday, December 13, 2011

When White Balance Matters


A simple assignment: Lester Chun, a music teacher in the Foster City School district for over 30 years, was about to receive an award from the Hillbarn Theatre for his dedication to music instruction. He is flanked by Lee Foster and Christine Krolik, the event's co-chairs.

When I arrived on location, I was immediately taken by the wonderful colonnade just outside the bar. Since the guest of honor had not yet arrived, I decided to see what I could do with the incandescent ambient lighting. I decided to start from the back and work forward. I made this first test shot with the daylight preset, F 4.0, 1/15, ISO 800.


The photo had a nice, warm feeling, but I wanted the subjects and the background to appear as the eye might see it. Since I planned on using flash, the two different color temperatures would certainly lead to some visual disconnect. So I chose the camera's standard Incandescent setting and re-shot the photograph. The results were pleasing and reasonably accurate. See below.


The next part was adding the artificial light. Since the ceiling was already dark, I decided to bounce a flash off the ceiling. This was done by placing a remote flash on the ground and aiming it upward at an angle. A used a blinder to shield the lens from the incoming light. I also installed a Nikon incandescent gel to better match the ambient lights. If you look closely, you can see the flash near the lower right hand corner of the doormat.

Lastly, I set up the main lighting. The simple setup included a light stand with a mounted Nikon SB-800 with a incandescent gel shot through a Zumbrella positioned high and at camera left. This gave a very wide, soft light, and have a very smooth transition from highlight to shadow. No additional fill was needed.

Immediately after I shot the photo for the paper (see top of post), I invited Mr. Chun's wife and daughter to join him.



A quick examination of the image showed the obvious glare on Mr. Chun's glasses. Also, there was a "hot" reflection of the Zumbrella in the background windows, a situation that could result in underexposed subjects. I was about to suggest some adjustments when I realized that dinner seating was beginning. If I wanted a wide shot that included the colonnade, I needed to start the change-over immediately. 

Since the set-up had already been done for the first shot, it was a simple matter to change to my second camera body with a fast, wide angle lens already installed. Since I had already set both cameras to the same ISO, shutter speed and aperture, I simply removed the SB-900 commander from one camera and placed it on the other. This wider shot gave a better sense of the location and used the ceiling lines and pillars to frame the shot and draw the viewers attention to the main subjects. The ceiling "bounce" light rebounded off the tiled floor and produced a nice highlight just behind the subjects. And I made sure that the exact center of the photo was covered by Mr. Chun's body. This way the reflection would not be visible in the final photograph.


While it would not have met the content requirements of the paper, it is a pleasing family photograph taken on a very special evening.

Sunday, December 4, 2011

Out Of Focus Backgrounds



I was trying to make a photograph that took advantage of the vibrant reds and yellows in the trees surrounding the parking lot of the Marin Arts and Gardens Center in San Anselmo in Marin County. It was a quiet Saturday and the parking lot was almost empty. While I arranged all of the lighting and made the appropriate exposure settings, a friend made the actual photograph.

Establishing The Background Exposure: If there is one thing that digital brings to the table, it is the ability to evaluate your photograph instantly. This image was built from the background forward. I selected a group of colorful leaves as a background. I established the proper exposure by taking a reading in the Aperture Priority mode, and transferring the settings manually to the camera. I made several test shots, experimenting with modest degrees of under and over exposure until I got something I liked. Examining the post-exposure histogram on the back of the camera told me the hightlights were not over-exposed beyond recovery. However, I had no idea of how the background would actually appear in the final photo. I concentrated only on the exposure, and settled on settings of 1/125 of a second at F 10.0, ISO 200, with a Cloudy White Balance preset on a Nikon D70s.

Establishing The Mark: In order to prevent the existing sunlight from affecting the exposure on my face, I moved myself until my own shadow completely disapppeared in the shadows cast by the surrounding trees. Next, I put a rock exactly where I stood. This would be my mark.

Background Test Shot: To get a better idea of how the background would actually appear, I moved to where I planned to make the photo. Next, I focused on the rock. With the focus locked in place, I re-framed the image so the background filled the frame, and made an exposure. This showed me how the background would actually look when I eventually stood on my mark, in front of the background, and had my photo taken.

Lighting The Foreground: Now came the foreground (subject) exposure. Since the final product was to be a tight head shot, I moved a lightstand as close as I could without it intruding in the final image. In the end, it was so close that I could reach out and adjust it. I shot an Nikon SB-800 through an Zumbrella from high camera left. I made sure that the speedlight's sensor eye pointed directly toward the camera positon. I believe the final output setting was 1/4 power (manual output), possibly lower than that. The flash was triggered with an infra-red triggering device, a Nikon SU-800, part of Nikon's iTTL Creative Lighting System. A convention optical light trigger could have been used, but the flash coming from an on-camera position can be distracting to your subject. The infrared signal from the SU-800 is far less obtrusive.

Getting The Look: When my photographer friend was ready to make the photo, I had her position herself, up and down, left and right, until the background behind me had a nice balance of light and dark. This resulted in her taking a bent, half-crouching stance. The real trick was selecting a longest focal length on my zoom lens. In this case, the distance from the subject to the camera as about 15 feet. The focal length was set to 300mm. The foreshortening effect made the background appear larger in relation to the foreground subject.

And with a single press of the shutter release, everything fell into place.