White Balance shading on 200/250 at DVinfo.net

Go Back   DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

JVC GY-HD Series Camera Systems
GY-HD 100 & 200 series ProHD HDV camcorders & decks.


Reply
 
Thread Tools Search this Thread
Old February 20th, 2007, 11:54 AM   #1
Major Player
 
Join Date: Dec 2006
Location: New York, NY
Posts: 460
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)
Sean Adair is offline   Reply With Quote
Old February 20th, 2007, 01:07 PM   #2
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.
Justin Ferar is offline   Reply With Quote
Old February 21st, 2007, 07:05 AM   #3
Major Player
 
Join Date: Dec 2006
Location: New York, NY
Posts: 460
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)
Sean Adair is offline   Reply With Quote
Old February 21st, 2007, 02:52 PM   #4
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.
Tyson Perkins is offline   Reply With Quote
Old February 21st, 2007, 04:53 PM   #5
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?
Justin Ferar is offline   Reply With Quote
Old February 21st, 2007, 06:58 PM   #6
Major Player
 
Join Date: Oct 2006
Location: sydney, australia
Posts: 221
yes im talking about more than the A - B - PRESET setting button
Tyson Perkins is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:46 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network