Is this an example of rolling shutter phenonemon? at DVinfo.net

Sherri Nestico · May 5th, 2010, 03:12 PM

One of our videographers shot this today with a 5D Mark II. I've never seen camera flashes come out this way on any of his other videos.

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Kent Frost · May 5th, 2010, 03:19 PM

Yep, that's exactly what that is. The duration of the other camera's flash is shorter than a single video frame, creating "flashing banding" in a few consecutive frames (due to most cameras having a pre-flash for focus assistance). You'll get it with strobes at parties, too. It's caused from the pixels of the CMOS sensor being scanned from top to bottom one line at a time, rather than simultaneously like a CCD sensor. The effect it has on a CCD sensor is different brightnesses from frame to frame instead of banding, due to the timing of the flash. If a flash goes off at the beginning of a given frame, that frame would be brighter than the one following it where the flash only lasted for a fraction of the duration of the video frame. There's a trade-off though. CCD sensors will give light-streaks (think flashlights, candles, christmas lights, light bulbs, etc) which appear as either vertical or horizontal, edge-to-edge streaks that emit from light sources.

Marcus Marchesseault · May 5th, 2010, 06:25 PM

An easy way to deal with this in post is to just use a white flash for the whole frame. Strobe lights firing quickly are probably something not ideal for a CMOS camera, but that is a rare occasion.

BTW, its "phenomenon".

Dale Guthormsen · May 5th, 2010, 06:36 PM

Good evening,

If you shoot many weddings, you better get the software that cleans that up for you!! I believe its new blu. It will save a lot of time. I shoot two cameras and i just swap cameras when that happens. as my second camera is a ccd camera.

dale

Sherri Nestico · May 6th, 2010, 08:03 AM

PHENOMENON

You are correct, Marcus. I can spell, I just can't type...:)

May 5th, 2010, 03:12 PM	#1
Sherri Nestico Regular Crew Join Date: Feb 2009 Location: Port St. Lucie, FL Posts: 167	Is this an example of rolling shutter phenonemon? One of our videographers shot this today with a 5D Mark II. I've never seen camera flashes come out this way on any of his other videos. Videos: Teacher of the Year finalist - Treasure Coast, FL \| TCPalm.com __________________ Follow me on Facebook! http://www.facebook.com/TCPalmSherriNestico Last edited by Sherri Nestico; May 6th, 2010 at 07:57 AM.

May 5th, 2010, 03:19 PM	#2
Kent Frost Regular Crew Join Date: Jul 2006 Location: Springfield, Missouri Posts: 117	Yep, that's exactly what that is. The duration of the other camera's flash is shorter than a single video frame, creating "flashing banding" in a few consecutive frames (due to most cameras having a pre-flash for focus assistance). You'll get it with strobes at parties, too. It's caused from the pixels of the CMOS sensor being scanned from top to bottom one line at a time, rather than simultaneously like a CCD sensor. The effect it has on a CCD sensor is different brightnesses from frame to frame instead of banding, due to the timing of the flash. If a flash goes off at the beginning of a given frame, that frame would be brighter than the one following it where the flash only lasted for a fraction of the duration of the video frame. There's a trade-off though. CCD sensors will give light-streaks (think flashlights, candles, christmas lights, light bulbs, etc) which appear as either vertical or horizontal, edge-to-edge streaks that emit from light sources. __________________ "Your world is all these elements; of light and sound, of taste, smell, and touch. Woven together in many dimensions on the fabulous loom of your brain. Your brain; the most complicated thing in the world, which you yourself grew...without even thinking about it."

May 5th, 2010, 06:36 PM	#4
Dale Guthormsen Inner Circle Join Date: Jun 2005 Location: Saskatchewan Posts: 3,048	Good evening, If you shoot many weddings, you better get the software that cleans that up for you!! I believe its new blu. It will save a lot of time. I shoot two cameras and i just swap cameras when that happens. as my second camera is a ccd camera. dale __________________ DATS ALL FOLKS Dale W. Guthormsen

May 6th, 2010, 08:03 AM	#5
Sherri Nestico Regular Crew Join Date: Feb 2009 Location: Port St. Lucie, FL Posts: 167	PHENOMENON You are correct, Marcus. I can spell, I just can't type...:) __________________ Follow me on Facebook! http://www.facebook.com/TCPalmSherriNestico

May 5th, 2010, 06:25 PM	#3
Marcus Marchesseault Trustee Join Date: Nov 2005 Location: Honolulu, HI Posts: 1,961	An easy way to deal with this in post is to just use a white flash for the whole frame. Strobe lights firing quickly are probably something not ideal for a CMOS camera, but that is a rare occasion. BTW, its "phenomenon".