White Balance shading on 200/250 at DVinfo.net

Sean Adair · February 20th, 2007, 11:54 AM

The 200/250 added the "white balance shading" to the menu - I gather to help counteract chromatic abberation as it neutralizes color, and should be set up for each specific lens used per directions.
I followed the instructions using my new 17x fujinon. This require a subjective judgement of color at top at bottom your monitor while viewing a white source. The adjustment goes from -127 to +126.
It's subtle, but I ended up finding +10 gave me the most neutral color. Have others found this useful in correcting CA with the 16x? What type of settings did you use? How about with the coveted 13x? It might give a hint in comparing the lenses if the correction amounts are consistently different between these lenses.

Justin Ferar · February 20th, 2007, 01:07 PM

Sean,

As I understand it, the white shading only corrects color bias and not CA, which is a result more of lens mechanics then electronics. Specifically lens dispersion.

The 200 comes pre-set for the Fuji 16x so I never even touched it yet.

Best.

Sean Adair · February 21st, 2007, 07:05 AM

Thanks Justin,
I since found more info here on the list:
http://dvinfo.net/conf/showthread.php?t=81636
Tim explains it as a a "form of CA". It is most certainly a correction for optics - using electronics...
Certainly, there are a number of complaints about the preset with the 16x from people there. The effect for me was quite subtle, and it was only after moving through the range several times that I settled on a spot different from default. Preset and 0 adjustment appear to be identical. Although the test is suggested at higher apertures, a lower aperture will make the adjustment easier.

This is part of the scene file with this camera, so keep that in mind when sharing scene files.

I guess what I was curious about, is whether this would help minimize the color fringing seen on high contrast details at open apertures that appear to be a common problem - casual tests don't seem to show any affect there. Generally, I'm quite happy with the lens performance I'm getting in my casual studio tests so far.

Tyson Perkins · February 21st, 2007, 02:52 PM

Can someone run me through the menu of the 200 in order to manually change the white balance as sometimes those two preset settings - A and B dont cut it.

Justin Ferar · February 21st, 2007, 04:53 PM

Tyson,

Are you talking about something other than the manual white balance button on the front?

Tyson Perkins · February 21st, 2007, 06:58 PM

yes im talking about more than the A - B - PRESET setting button

February 20th, 2007, 11:54 AM	#1
Sean Adair Major Player Join Date: Dec 2006 Location: New York, NY Posts: 463	White Balance shading on 200/250 The 200/250 added the "white balance shading" to the menu - I gather to help counteract chromatic abberation as it neutralizes color, and should be set up for each specific lens used per directions. I followed the instructions using my new 17x fujinon. This require a subjective judgement of color at top at bottom your monitor while viewing a white source. The adjustment goes from -127 to +126. It's subtle, but I ended up finding +10 gave me the most neutral color. Have others found this useful in correcting CA with the 16x? What type of settings did you use? How about with the coveted 13x? It might give a hint in comparing the lenses if the correction amounts are consistently different between these lenses. __________________ Sean Adair - NYC - www.adairproductions.com JVC GY-HM-700 with 17x5 lens, MacPro 3.2ghz 8-core, 18gb. (JVC HD200 4 sale soon)

February 20th, 2007, 01:07 PM	#2
Justin Ferar Major Player Join Date: Aug 2006 Location: Larkspur, CA Posts: 378	Sean, As I understand it, the white shading only corrects color bias and not CA, which is a result more of lens mechanics then electronics. Specifically lens dispersion. The 200 comes pre-set for the Fuji 16x so I never even touched it yet. Best. __________________ www.justinferar.com www.weddingsonfilm.com

February 21st, 2007, 07:05 AM	#3
Sean Adair Major Player Join Date: Dec 2006 Location: New York, NY Posts: 463	Thanks Justin, I since found more info here on the list: http://dvinfo.net/conf/showthread.php?t=81636 Tim explains it as a a "form of CA". It is most certainly a correction for optics - using electronics... Certainly, there are a number of complaints about the preset with the 16x from people there. The effect for me was quite subtle, and it was only after moving through the range several times that I settled on a spot different from default. Preset and 0 adjustment appear to be identical. Although the test is suggested at higher apertures, a lower aperture will make the adjustment easier. This is part of the scene file with this camera, so keep that in mind when sharing scene files. I guess what I was curious about, is whether this would help minimize the color fringing seen on high contrast details at open apertures that appear to be a common problem - casual tests don't seem to show any affect there. Generally, I'm quite happy with the lens performance I'm getting in my casual studio tests so far. __________________ Sean Adair - NYC - www.adairproductions.com JVC GY-HM-700 with 17x5 lens, MacPro 3.2ghz 8-core, 18gb. (JVC HD200 4 sale soon)

February 21st, 2007, 04:53 PM	#5
Justin Ferar Major Player Join Date: Aug 2006 Location: Larkspur, CA Posts: 378	Tyson, Are you talking about something other than the manual white balance button on the front? __________________ www.justinferar.com www.weddingsonfilm.com

February 21st, 2007, 02:52 PM	#4
Tyson Perkins Major Player Join Date: Oct 2006 Location: sydney, australia Posts: 221	Can someone run me through the menu of the 200 in order to manually change the white balance as sometimes those two preset settings - A and B dont cut it.

February 21st, 2007, 06:58 PM	#6
Tyson Perkins Major Player Join Date: Oct 2006 Location: sydney, australia Posts: 221	yes im talking about more than the A - B - PRESET setting button