|
|||||||||
![]() |
|
Thread Tools | Search this Thread |
![]() |
#1 |
Regular Crew
Join Date: Jul 2002
Location: Tokyo
Posts: 102
|
Is this a rolling shutter issue or is my camera faulty??
I'm experiencing strobing artifacts in some of the footage shot with my EX1. Until now I thought it was due to the camera's rolling shutter while shooting under fluorescent lights. But yesterday it happened while shooting outdoors in the middle of the day, nowhere near any lights. Sometimes the strobing would go away after a few seconds, while at other times it would persist throughout the entire shot. The problem is not like the jellocam or partial exposure artifacts documented on various forums. It's more like a color shift that moves up and down the screen. I've posted an example here -->
http://www.mediakobo.com/watersafety.mp4 It's most noticeable when you advance the clip frame by frame. I had the camera set to full manual during this shoot. Has anyone else experienced this?
__________________
Media Kobo Japan |
![]() |
![]() |
![]() |
#2 |
Major Player
Join Date: May 2002
Location: West Central Florida
Posts: 762
|
I hate to say this, but I think I saw this once too. It happened so briefly that I almost didn't see it and it never happened a second time. However, since my EX1 lost its' ability to focus to infinity, it's now back at Sony Service. Maybe it will screw up while THEY have it.
|
![]() |
![]() |
![]() |
#3 |
Trustee
Join Date: Feb 2006
Location: USA
Posts: 1,684
|
Looks weird, but if you want advice you need to tell us all your settings.
|
![]() |
![]() |
![]() |
#4 |
Regular Crew
Join Date: Jul 2002
Location: Tokyo
Posts: 102
|
As I remember, I was shooting 1080 30P HQ, shutter at 1/60, ND filter 2, aperture around f4, everything set to full manual (zoom, white balance, focus, iris), steady shot on, built-in camera mic only...
is there anything else that would help?
__________________
Media Kobo Japan |
![]() |
![]() |
![]() |
#5 |
Regular Crew
Join Date: Jan 2008
Location: Japan
Posts: 172
|
Could it be caused by the water reflection?
|
![]() |
![]() |
![]() |
#6 |
Regular Crew
Join Date: Jan 2008
Location: Salisbury, MD
Posts: 122
|
Looks like a florescent light issue.
Mick Haensler Higher Ground Media |
![]() |
![]() |
![]() |
#7 |
Regular Crew
Join Date: Jul 2002
Location: Tokyo
Posts: 102
|
It does look similar to fluorescent light strobing but 1) there weren't any lights whatsoever near this outdoor pool, and 2) even if there were, the bright sunlight would have drowned out their effect.
Here's a larger sample that shows the artifacts more clearly. http://www.mediakobo.com/watersafety2.mp4 here you can see faint strobing bands of blue-ish and red-ish color.
__________________
Media Kobo Japan |
![]() |
![]() |
![]() |
#8 |
Regular Crew
Join Date: Nov 2004
Posts: 1,414
|
What it looks like to me is that the water is reflecting the light onto the wall and the
camera is trying its best to auto white balance the color shifts of the water ripples being projected into the scene.. |
![]() |
![]() |
![]() |
#9 |
Inner Circle
Join Date: Nov 2005
Location: Lowestoft - UK
Posts: 4,039
|
It looks 100% electronic to me - I've never seen reflections cause a colour shift, and the shifts are only going one way, reflections from the water would go both. Probably worth shooting a white card and deliberately overexposing - this should prove if it is level related, and should give you more scope for experimenting before sending it back for service. Is it visible in the viewfinder during record, or only on playback?
|
![]() |
![]() |
![]() |
#10 |
Trustee
Join Date: Jan 2006
Location: New York, NY
Posts: 1,267
|
Was your battery near the end of its life. Not sure about the EX1 but some cameras can act strange when the battery is weak but not causing a warning.
|
![]() |
![]() |
![]() |
#11 |
Major Player
Join Date: May 2002
Location: West Central Florida
Posts: 762
|
Rob, I included your links to your footage in an email to the guy at Sony Service who I'm dealing with re: my focus problems. Since I saw this once (VERY briefly) with my EX1, I'll try to get an answer from him about what he thinks is causing this. I'd hate to open yet another can of worms with this camera, but if this is happening with certain EX1's, I'd like them to know about it. Might as well have them aware of it while they have my camera in the shop......again.
|
![]() |
![]() |
![]() |
#12 |
Regular Crew
Join Date: Jul 2002
Location: Tokyo
Posts: 102
|
Dave,
Thanks for referring this problem to Sony service. I'd really like to hear his opinion on this. Auto White Balance was turned off but the color shifting does look like it could be related to AWB somehow. Battery life was at 80%. I saw the strobing in the LCD every time it happened during the shoot.
__________________
Media Kobo Japan |
![]() |
![]() |
![]() |
#13 |
Major Player
Join Date: May 2002
Location: West Central Florida
Posts: 762
|
I don't think it's a AWB issue as the whole screen would probably "pulse" with the color changes if it was jumping between two different color balances. I'll pass along anything I get from them....if anything.
|
![]() |
![]() |
![]() |
#14 |
Trustee
Join Date: Sep 2005
Location: Gilbert, AZ
Posts: 1,896
|
Never seen this.
One quick solution is to bring back the EX1 to that location and try it again. If you're not seeing it anywhere else, there's something unique to the lighting in that area. |
![]() |
![]() |
![]() |
#15 |
Regular Crew
Join Date: Jul 2002
Location: Tokyo
Posts: 102
|
I was able to recreate the issue in my office this morning. It seems to be triggered by a combination of bright light and white balancing, although I can not confirm this without further testing. Changing the shutter speed from 60 to a higher setting, such as 250 or 500, and then returning to 60 nearly eliminates the effect, but the problem returns after switching the camera off and on. Changing the Flicker Reduce setting from "on" to "auto" seems to have minimized the issue. Maybe that's what was causing the effect?
Here's another sample I took in my office. http://www.mediakobo.com/blinds.mp4 The room lights were all turned off. Only natural light is entering the camera.
__________________
Media Kobo Japan |
![]() |
![]() |
![]() |
| ||||||
|
|