cgb2955
BALLC_4B_IMG_2121
This image is an iteration of a third test of additive color. This test attempts to determine whether luminance provided to a surface by a light source can affect additive color.
Setup: A large rectangle of black velvet was laid flat on the floor, and three identical rectangles of white ("snowcap") cardstock were laid on top of the velvet. The camera shutter was opened. An external flash unit with a red gel was fired once from a height of approximately 30 inches. One rectangle (sheet) was removed. The flash was fired again. A second sheet was removed. The flash was fired for a third time and the third sheet was removed. The camera shutter was closed.
The sheet that appears to be on the bottom of the pile, the darkest sheet, was actually on top and the first one to be removed after one flash of the strobe. The middle sheet was the second one removed after two flashes. The bottom sheet, with three flashes, is the brightest one. The edges of sheet are visible as shadow lines on the sheets underneath them.
The added light should provide more colors for light painting.
The gel used was Rogue Lighting Filters Bright Red (f-stop loss 3 1/2). The flash unit used was a Yongnuo YN-568EX II 4-Channel TTL Flash Speedlite for Canon E-TTL/E-TTL II Cameras. A flash unit was used to provide more control over the amount of light to be supplied. Its output is more measurable and repeatable than a flashlight timed by a human.
BALLC_4B_IMG_2121
This image is an iteration of a third test of additive color. This test attempts to determine whether luminance provided to a surface by a light source can affect additive color.
Setup: A large rectangle of black velvet was laid flat on the floor, and three identical rectangles of white ("snowcap") cardstock were laid on top of the velvet. The camera shutter was opened. An external flash unit with a red gel was fired once from a height of approximately 30 inches. One rectangle (sheet) was removed. The flash was fired again. A second sheet was removed. The flash was fired for a third time and the third sheet was removed. The camera shutter was closed.
The sheet that appears to be on the bottom of the pile, the darkest sheet, was actually on top and the first one to be removed after one flash of the strobe. The middle sheet was the second one removed after two flashes. The bottom sheet, with three flashes, is the brightest one. The edges of sheet are visible as shadow lines on the sheets underneath them.
The added light should provide more colors for light painting.
The gel used was Rogue Lighting Filters Bright Red (f-stop loss 3 1/2). The flash unit used was a Yongnuo YN-568EX II 4-Channel TTL Flash Speedlite for Canon E-TTL/E-TTL II Cameras. A flash unit was used to provide more control over the amount of light to be supplied. Its output is more measurable and repeatable than a flashlight timed by a human.