Shooting Projected Images w/ 7D at DVinfo.net
DV Info Net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.

Reply
 
Thread Tools Search this Thread
Old April 8th, 2010, 12:45 AM   #1
Trustee
 
Join Date: May 2007
Location: Minneapolis, MN
Posts: 1,313
Shooting Projected Images w/ 7D

Tonight I shot some footage for an advertisement for a HD projector with the 7D. When I pointed the camera at the screen, however, colored bars appeared over the image – a sync issue with the projector. The projector was displaying to a 60hz image, and the 7D was recording in 24p with a shutter speed of 1/60. Should work right? Not really.

I kept having problems and tried a number of different settings to try and remedy the issue. All of a sudden, it looked fine. When I came back 5 minutes later to test some more, the bars reappeared. My settings were 1/60, 1080p24.

What I figured out is that the camera only syncs with the projected images when turned on at exactly the right time. So, I kept flipping the on/off switch until it looked normal. Usually took 8-10 times to work. Not sure what the technical explanation is for this, but I thought I'd share in case someone is having a similar issue with recording projected images or perhaps television screens?
__________________
Nate Haustein PXW-FX9 / FCPX
www.flightcreativemedia.com
Nate Haustein is offline   Reply With Quote
Old April 18th, 2010, 12:44 PM   #2
Tourist
 
Join Date: Apr 2010
Location: Topanga, CA
Posts: 1
sync?

Not sure if it would make a difference or not, but were you using the 7d with battery power, or with an AC adapter plugged into the same outlet as the projector?

I'll test this sometime soon when I have a free second.

-Joe
Joe Pleniukas is offline   Reply With Quote
Old April 18th, 2010, 06:08 PM   #3
Regular Crew
 
Join Date: Feb 2009
Location: SF Bay Area, CA, USA
Posts: 78
Fellow Nate,

I've had similar issues trying to capture the work we do on Microsoft Surface, which has a short-throw rear-projection unit inside...trying to lock on sensible frame rates didn't really work. I've had to use the ClearScan abilities of my XH-A1 instead to shoot such footage...I didn't find a sensible workaround on my 7D.

Not saying there isn't a solution, but I don't think it's just you, if that helps at all. ;-)
__________________
designer of media for eyes and ears
sound design and field recording at http://www.noisejockey.net/blog
Nathan Moody is offline   Reply With Quote
Old April 18th, 2010, 06:14 PM   #4
Trustee
 
Join Date: May 2007
Location: Minneapolis, MN
Posts: 1,313
The 7D was on battery power, and set to 1/60, F1.8, and 1080p24. My XHA1 worked great first time at 1/60, but that's just not as sexy as the DSLR, so I chose to suffer instead. Luckily my actors (read good-natured friends) were patient with my flipping the cam on and off all the time.

Here's some quick and dirty pics from the FCP timeline to show what I'm talking about, one with the problem and one without the problem:
Attached Thumbnails
Shooting Projected Images w/ 7D-screen-shot-2010-04-18-7.10.31-pm.png   Shooting Projected Images w/ 7D-screen-shot-2010-04-18-7.10.19-pm.png  

__________________
Nate Haustein PXW-FX9 / FCPX
www.flightcreativemedia.com
Nate Haustein 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...

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

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK


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 EOS Crop Sensor for HD

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



All times are GMT -6. The time now is 06:42 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network