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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 02 Mar 2010 (Tuesday) 08:14
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White balance seems off, can anyone input?

 
Gel
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Mar 02, 2010 08:14 |  #1

Two pictures, same setup.

The first image the white balance was set to auto on the 5D mkII
The second it was set to flash.
Lighting used, 2 x Bowens Monolights + white brollies, modelling lights set to turn off with the flash firing.

The auto one looks better than the flash set one, can anyone explain why? The Iso, lens setting were the same, the aperture on one is 5, the other 5.6 (Full Exif data should be there).

Both shot at 1/160, both flash units set with a Sekonik 358.

Both images taken into lightroom and converted to jpeg, nothing has been changed.

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johnlo
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Mar 02, 2010 08:25 |  #2

i can be totally wrong.. the K for your monolight might be different for your camera flash setting.. to get the best result, you need to set on custom white balance for your monolight.


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loydall
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Mar 02, 2010 08:31 |  #3

I never really bother with the white balance on camera (usually leave it on auto). I just set a custom white balance in LIghtroom/Photoshop using the white balance selector.

Have you tried that?


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Gel
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Mar 02, 2010 08:35 |  #4

loydall wrote in post #9712834 (external link)
I never really bother with the white balance on camera (usually leave it on auto). I just set a custom white balance in LIghtroom/Photoshop using the white balance selector.

Have you tried that?

Yep tried that.

It's not a biggie to me just something I want to understand 'why' it's happening.

I'll probably get myself an 18% grey card and put in a custom setup as Johnlo suggested.

Auto has worked well so far it kinda caught me by suprise when I did something that I thought was right only to find it gave poor results.


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cdifoto
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Mar 02, 2010 08:38 |  #5

Nobody's picked up on the joke yet?


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Gel
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Mar 02, 2010 08:57 |  #6

cdifoto wrote in post #9712867 (external link)
Nobody's picked up on the joke yet?

Nope


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dmward
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Mar 02, 2010 09:06 |  #7

If you are using Lightroom and shooting raw, the white balance set by the camera is only used for the initial thumbnail that is brought on-screen. The Adobe Standard is the default camera calibration. LR changes the screen image to that default which is why there is a pop with a color change when you first see the image in LR.

For studio shooting, I always use a color checker reference. The new PassPort is ideal.
It also works in the field when there are unusual lighting conditions.

There is software (Adobe DNG Profiler or the app that comes with the color checker) for making custom camera calibration profiles that Lightroom and Camera Raw use.

If you choose to use a color checker, remember that Adobe uses the second from left gray square for white balance.

In addition to white balance the color checker is a good way to fine tune exposure for the light setup.

There are pages on my tutorial site explaining how I use the color checker to calibrate the camera and fine tune exposure.

Here is an example of the reference shot:


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FJ ­ LOVE
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Mar 02, 2010 09:06 |  #8

Gel nothing has changed but you have selected two different white balance settings, auto and flash. if you want your white balance to remain the same you will have to set a custom white balance or pick a temperature eg. 5600 K. by using auto your letting the camera choose random settings


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Gel
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Mar 02, 2010 09:28 |  #9

Righto.

Thanks for all the input, I'll set the color balance manually in future.


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cdifoto
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Mar 02, 2010 09:40 |  #10

Sad.


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Mar 02, 2010 10:36 |  #11

I'll not comment on the WB setting first, but I will make a different observation which does affect the WB/tint...

Get your subject FARTHER from the background!!! One can see, by looking at the floor tiles, that there is significant bounce back of light contamination by the backround which is in use, you can see it for 3-4' on the floor (assuming 6" floor tiles)


Now, onto the WB question originally posted...the Auto WB setting will be influenced by what the camera perceives, and it is likely getting fooled...the Canon Auto WB is hardly something to be used as a good standard! And the Flash WB setting is not identical to Daylight WB setting, since electronic flash setting is typically cooler by 300K


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pkalona
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Mar 02, 2010 12:11 |  #12

White balance aside, seems pretty obvious why the first image looks better (even with the ugly edge of the floor molding showing). It's the way it's tilted of course.




  
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Sam|McGuire
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Mar 02, 2010 13:09 |  #13

What power are the strobes firing at? I know some studio strobes tend to give off a color cast at lower power.


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jmoney916
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Mar 02, 2010 16:18 as a reply to  @ Sam|McGuire's post |  #14

Get yourself a digital grey kard. 18% cards are used for exposure not white balance.


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kfyount
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Mar 02, 2010 17:39 |  #15

cdifoto wrote in post #9712867 (external link)
Nobody's picked up on the joke yet?

Well - it is obvious to me! When the "flash" setting is used, it changes the hat to a cane and also makes the white shoes look black. It also seems to have a "TV" impact (i.e., adds a few pounds).

LOL


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White balance seems off, can anyone input?
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