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SportsShooter.com: Member Message Board

Strange 10d problem......I guess its a problem
Matthew Bush, Student/Intern, Photographer
Ellisville | MS | USA | Posted: 1:07 AM on 02.04.05
->> Hey everybody,
Tonight I was shooting b-ball with a borrowed 1.4 50mm without a flash and noticed something, in the gym I shoot flash at 250th and f-2.8 and the wb in the gym is awful becuause of the low quality lights, tonight I shoot 500th at 1.8 no flash but the problem I noticed tonight was I shoot on incadesant wb and never touched my settings and in a burst some images would have a diffrent wb. Does the 10d still use some auto wb on incadesant, or is my 10d giving up on me.
I will try to get some examples up as soon as I get done with a project for class.
Thanks yall
Matthew Bush
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Guy Rhodes, Student/Intern, Photographer
East Chicago | IN | USA | Posted: 4:02 AM on 02.04.05
->> "tonight I shoot 500th at 1.8 no flash but the problem I noticed tonight was I shoot on incadesant wb and never touched my settings and in a burst some images would have a diffrent wb"

Matthew,

During motor-drive bursts with a quick shutter speed, you're probably capturing different points of the rise and fall of the sine wave arc in the discharge lighting present in your gym.

Discharge lamps pulse 60 times per second here in the U.S. - usually too fast for the human eye to readily notice. Along with this pulsing comes a shift in the color temperature of the light, especially on mercury vapor and fluorescent lamps.

Scroll down at the following URL and look at Max Morse's winning image (of the blurry-panned baseball pitcher):

http://www.sportsshooter.com/2003_contest_winners/

You'll notice that some of the light streaks in the background aren't constant. You can see breaks in the streaks, they look almost like "beads" of light connected together. These bright "beads" in the streak are the peaks in the electrical wave powering the discharge lamp in the fixture.

Among the many reasons I strobe whenever I walk into an arena or room with discharge lighting whenever I can. I hate discharge lighting.

Make sense?
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Thread Title: Strange 10d problem......I guess its a problem
Thread Started By: Matthew Bush
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