shifting colors at dusk at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


Reply
 
Thread Tools Search this Thread
Old September 22nd, 2007, 01:51 AM   #1
Regular Crew
 
Join Date: Aug 2007
Location: Oklahoma City, OK
Posts: 30
shifting colors at dusk

Occasionally when shooting my son's football games I can see a color shift toward a reddish hue, then shift back to to a balanced color. Tonight it occurred at dusk under stadium lighting. I was shooting in manual mode at 1/120 to 1/150 shutter speed, f3.0. Custom WB set using lastolite.

I have observed this during previous practice sessions when the shutter speed was too fast.

Anybody have any ideas as to what is going on?
Brent Hamilton is offline   Reply With Quote
Old September 22nd, 2007, 03:54 AM   #2
Major Player
 
Join Date: Mar 2007
Location: Madrid, Spain
Posts: 238
Quote:
Originally Posted by Brent Hamilton View Post
Occasionally when shooting my son's football games I can see a color shift toward a reddish hue, then shift back to to a balanced color. Tonight it occurred at dusk under stadium lighting. I was shooting in manual mode at 1/120 to 1/150 shutter speed, f3.0. Custom WB set using lastolite.

I have observed this during previous practice sessions when the shutter speed was too fast.

Anybody have any ideas as to what is going on?
I think you can find a number of threads on this or similar issues. Take a look at the "No Magenta" preset, it should address that problem.

Cheers, Erik
Erik Norgaard is offline   Reply With Quote
Old September 22nd, 2007, 07:02 AM   #3
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,294
Do you see this at 1/120, or just at 1/150 and faster shutter? Do you see it ata 1/60 shutter?

If only at 1/150 and faster shutter, it is probably caused by the slight variation in output color of the stadium lights over the power frequency half-cycle, and the fact that the camcorder field rate is not exactly at line frequency. Keeping the shutter at 1/120 or 1/60 would be a solution.
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply With Quote
Old September 22nd, 2007, 09:36 AM   #4
Regular Crew
 
Join Date: Aug 2007
Location: Oklahoma City, OK
Posts: 30
It happens at 1/150 and faster for sure. I've also noted at some stadiums 1/150 or 1/120 shows no phasing. I guess the next time this occurs I'll keep lowering the shutter speed until the phasing disappears. However for shooting football games I probably should not go lower than 1/100...correct?
Brent Hamilton is offline   Reply With Quote
Old September 22nd, 2007, 06:44 PM   #5
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,294
Faster shutter allows better freezing of action within a video field, so you have less motion blur in field captures, and perhaps more distinct interlace artifacts in frame grabs. However, faster shutter can also yield a bit more strobe-like feel to video.

Slower shutter will give video a more smooth/fluid look thanks to the motion blur that makes the visual transition from field to field not as sharp. Which is better depends on which look you prefer. Also the slower shutter may allow smaller aperture for better depth of field, if that is an issue, or perhaps a biit less gain for a cleaner image.

Whether or not it is an issue at a field will depend on the type lighting used. Discharge lamps are more prone to this effect, but if 3-phase lighting is used on each light pole, it will not be as pronounced.
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply With Quote
Old September 23rd, 2007, 07:50 PM   #6
Regular Crew
 
Join Date: Aug 2007
Location: Oklahoma City, OK
Posts: 30
Thank you for the information.
Brent Hamilton 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 > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:01 PM.


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