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| p.1 #4 · what phenomenon causes this? |
The light reaching the camera is a byproduct of the angle from the light source, reflected off the subject to the camera.
My hypothesis (read GUESS, if you will) is that they are using "4 light" banks for lighting. The notability of it as 4 distinct strands is the light reflecting from each of the different lights off of the specular (round) subjects iaw AI=AR as it changes with subject position variance. Contrast this with the "blurry mess" of the letter "G" in the name Gibson which shows the typical blurry mess that we are more accustomed to seeing.
I'm guessing that while the flat surfaces reveal a "continuous" reflection/blurry mess as their motion changes the AI=AR, the "point" reflections of the specular components "skip" from one light to the next in the light bank as their positions change relative to the camer/light source relationship ... if that makes any sense.
If it were due to a stroboscopic light source, we'd see the same multi-position characteristic in all portions of the subject that moved. Here, the rounded surfaces are acting differently than the flat surfaces. Noting the lines in the machine heads/tuning knobs/strings as well, but not in the lettering.
Notice also how the bridge while highly reflective white, it's flat surface doesn't exhibit the same stroboscopic effect as the other round highly reflective surfaces do. Also, note how the "E" string shows the multi-strand effect in purple between the bridge and the tuning pegs, but we don't even really see the "E" string below the bridge. The angle of the "E" string (and two next to it) from the bridge to the tuning pegs is different and is picking up the refection from a bank of purple lights, while on the opposite side, the tuning knobs/pegs are in a position for AI=AR to pick up the reflection from a bank of blue lights.
Anyway, that's my read on it.
Any more examples or shots that include the stage lighting?
BTW, that's why jewelry stores use multi-point lighting, so that no matter which way your turn, you keep getting specular reflections. Better to step out into the mall lighting (outside or some area without the multi-point lighting) to evaluate how "sparkly" you're really gonna be before committing a chunk of change.