Flickering on a timelapse shot problem at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Sony XDCAM EX Pro Handhelds
Sony PMW-300, PXW-X200, PXW-X180 (back to EX3 & EX1) recording to SxS flash memory.


Reply
 
Thread Tools Search this Thread
Old February 18th, 2008, 12:16 PM   #1
Regular Crew
 
Join Date: Nov 2005
Location: San Francisco, CA
Posts: 180
Flickering on a timelapse shot problem

Hi Folks,

I was doing some tests this weekend and came away with one weird shot.

Take a look at this link and let me know what you think:

http://jamiebaughman.com/street_corner.mov

You'll notice in the top area of the frame there's some flickering...almost like the light source from the topside of the camera is changing. I wasn't standing under a traffic light, street light, etc. Also, it was a clear blue sunny day. So a light source the size of a traffic light or street lamp wouldn't be powerful enough to make this happen. This is happening in the non-compressed file as well.

For comparison, here's another test I did against a clear blus sky the same day. No flickering here:

http://jamiebaughman.com/cloud_lapse.mov

Thanks in advance.
__________________
Jamie Baughman - Kilroy Films - Sony PMW EX-1 - Final Cut 2
http://www.kilroyfilms.com
Jamie Baughman is offline   Reply With Quote
Old February 18th, 2008, 12:50 PM   #2
Major Player
 
Join Date: Nov 2007
Location: Los Angeles, CA
Posts: 498
Your overall exposure looks like it's changing. Did you have auto iris on?

When a dark car pulls in front of the camera, it looks like the camera is compensating by making the overall exposure brighter.

Auto iris is great for time lapse, but only if higher frequency events aren't going to affect it. I would use it for higher angle work - landscapes etc, and nothing where traffic movement would trigger it.

Same for auto shutter, of course.
Eric Pascarelli is offline   Reply With Quote
Old February 18th, 2008, 01:09 PM   #3
Major Player
 
Join Date: Oct 2001
Location: Washington D.C. Metro Area
Posts: 384
I think the biggest culprit is auto iris.

I typed a bunch of stuff then noticed Eric Pascarelli beat me to it. He's right. He also spared you my novella- so thank him.

Other than that the only thing I have to add is that in addition to simply blocking light it looks as though you had some negative fill in there- but compared to the auto iris that's small potatoes.
__________________
Alexander Ibrahim
http://www.alexanderibrahim.net
Alexander Ibrahim is offline   Reply With Quote
Old February 18th, 2008, 03:08 PM   #4
Regular Crew
 
Join Date: Nov 2005
Location: San Francisco, CA
Posts: 180
Eric and Alexander,

Thanks much for your posts back. I was certain I was in auto iris, but since I'm still new to the camera it is entirely possible that I made such a bush league move.

Since the cloud scatter is not suffering from the same thing I'll bet that's what it was...

Thanks!
__________________
Jamie Baughman - Kilroy Films - Sony PMW EX-1 - Final Cut 2
http://www.kilroyfilms.com
Jamie Baughman 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 > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:12 PM.


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