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Thread started 04 Oct 2007 (Thursday) 22:01
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Is my shutter faulty? 40d

 
coleygm
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Oct 04, 2007 22:01 |  #1

I recently got the new 40d and have been in love with it from first use. I've shot a few thousand frames with it already, but was stunned to see this today while shooting a volleyball game. notice the color casts from right to right.


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My first inclinatoin is that there is something now wrong with the shutter, but i only get this problem when shooting around aprox 1/500 at HighSpeed (6.5 fps). The problem is less obvoius the slower the shutter. If i switched the drive to normal speed (3.5 fps)...no problem at all.

Now, i shot volleyball yesturday at our home gym without any issues. It's a newer facility with great lighting. Todays game was an old gym with really old lights, etc...

All that being said, do i have a camera problem...or is this something i just never knew about Incandescent/fluoresce​nt lights. I know that these lights have a cycle that the human eye can't see, and as this is the fastest camera i've ever owned, maybe i've just never run into this previously? will test outside tomarrow in the daylight, but the fear that my 40d is bad is killing me.

If anyone has a camera that can do 6+ fps...turn a few incandescent lights on in your house, and fire 5 shots or so at 1/500 or higher...and see if you don't see even slight lighting differences shot to shot. I tried that tonight and i do.

any info is greatly appreciated.

Greg
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rabidcow
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Oct 04, 2007 22:05 |  #2

That is typical of gym lighting, the color shift has to do with the "cycle" of the lights. I do not see an exposure difference, only color. I don't think that you need to worry about your shutter.


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Sauk
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Oct 04, 2007 22:06 |  #3

kind of off subject, but what iso did you shoot those at?




  
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coleygm
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Oct 04, 2007 22:26 |  #4

AthleticsPhotog wrote in post #4066783 (external link)
kind of off subject, but what iso did you shoot those at?

3200iso f/2.8 1/500


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coleygm
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Oct 04, 2007 22:30 |  #5

rabidcow wrote in post #4066774 (external link)
That is typical of gym lighting, the color shift has to do with the "cycle" of the lights. I do not see an exposure difference, only color. I don't think that you need to worry about your shutter.

I've shot thousands of pictures in gyms and never seen this before. So is this just the fact that my camera is fast enough to pick up on this now? Like i said...shooting at 3.5 fps at any shutter speed or 6.5 and less than around 1/400th doesn't produce the issue. ...but 6.5fps at 400+ and this is what i got.

I seriously hope your right though as it would make me very happy not to have to worry about a defective camera.

...and assuming this is common, how do yall all deal with it? correcting the color shift is going to take forever in the shots i need to keep.


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pieq314
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Oct 04, 2007 22:37 |  #6

If the lighting is fluorescent, then, it explains it. The light cycles at 120 Hz, so at high shutter speed, you may see something strange.


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coleygm
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Oct 04, 2007 22:58 |  #7

pieq314 wrote in post #4066977 (external link)
If the lighting is fluorescent, then, it explains it. The light cycles at 120 Hz, so at high shutter speed, you may see something strange.

I'm assuming it's the fps though as i've always shot 1/400-1/640 in gyms, but usually at 3.5fps.

Or are not all fluorescents created equal? This was the first time shooting in this gym and it is old, dank, and yellow. the gym i usually shoot at is fluorescent too (or so my WB tells me) but much brighter as it's all new....never had a problem there even at 6.5 fps.

thoughts?

I really apprecate the info


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coleygm
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Oct 04, 2007 23:05 as a reply to  @ coleygm's post |  #8

Maybe i found the answer (and yes, everyone above was right!)

"Modern, quality fluorescent lights don't have this problem because they pulse thousands of times a second instead of 50 or 60 times. The older fixtures pulse at the speed of the power grid and the new "electronic" ballasts create their own frequency. I'm not even sure the older "magnetic" ballasts are up to code in this country anymore as industrial lighting has had to switch to more energy efficient tubes that generally use electronic ballasts. FYI, compact fluorescents pulse thousands of times a second (electronic ballast) so they should be fine for most applications."

I guess to video people, this is a real nightmare.

thanks everyone


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Oct 04, 2007 23:28 |  #9

good old sodium lamps..


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Is my shutter faulty? 40d
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