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Thread started 22 Aug 2012 (Wednesday) 18:08
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Problem with my T4i?

 
Dan ­ Kearley
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Aug 22, 2012 18:08 |  #1

HiHi;

So I'm on my 2nd T4i now because the first one started showing this weird green banding on the display while in video or live mode. Today I think this new one is doing the same thing.

http://www.youtube.com …=9xzsD0D0Rok&fe​ature=plcp (external link)

I find I have a really hard time seeing it when I've got more light or when I get the exposure set a little brighter.

I'm not sure if it's showing in my actually photos.. I'm going to experiment more.

Has anyone ever seen this?

Thanks!




  
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oldvultureface
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Aug 22, 2012 18:55 |  #2

Cyclical lighting may be the culprit. Fluorescents play havoc with banding and odd colors.




  
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Dan ­ Kearley
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Aug 22, 2012 19:17 |  #3

Interesting. I'll try going outside in a bit.

Thanks for the info!




  
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Dawicka2
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Aug 22, 2012 19:23 |  #4

Yeah.. And being that its in a kitchen, prob is the fluorescent lights like oldvultureface said.


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kfreels
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Aug 23, 2012 00:05 as a reply to  @ Dawicka2's post |  #5

I concur on the lighting. The frequency of the color shift of the lighting is slightly off from the framerate causing a color roll. This can be caused by the light itself or frequency variations from power coming into the building. Try making some changes to your shutter speed and framerates. Also if possible, try changing the light bulbs (if they are compact fluorescents) or changing out the ballast if it is a regular fluorescent. Incandescent bulbs shouldn't have this problem.


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John ­ from ­ PA
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Aug 23, 2012 06:15 |  #6

Excellent explanation of the problem and fix over at http://producers.turnh​ere.com …on-your-dslr-footage.html (external link).




  
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waterrockets
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Aug 23, 2012 08:27 |  #7

Interesting. Same reason I have incandescent lights over my table saw -- fluorescents can freeze a spinning blade O_o


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kfreels
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Aug 23, 2012 12:33 |  #8

waterrockets wrote in post #14895824 (external link)
Interesting. Same reason I have incandescent lights over my table saw -- fluorescents can freeze a spinning blade O_o

And I thought I was the only person who noticed this. Nothing like a spinning blade that looks stationary. :-P


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Dan ­ Kearley
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Aug 23, 2012 13:13 |  #9

Great info here, thanks! I'll do some more testing later.




  
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Mark_48
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Aug 23, 2012 16:05 as a reply to  @ Dan Kearley's post |  #10

A couple of shots under a CFL bulb at higher shutter speeds (approx 1/250th). The exposure captures the high and low point in the "flicker" of the light. I changed the camera orientation to show the shutter sweep direction across the sensor.

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Problem with my T4i?
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