VERY STRANGE - Apparent CCD color splitting at DVinfo.net

DJ Kinney · July 4th, 2006, 12:26 PM

So this is odd. I was shooting with a GL2, a passed-out guy across the street. About 75 feet away, with zoom pretty close. A bicycle passed in front of the guy, and the image suddenly jumps in its apparent position. Now, I noticed this because it looked like the camera moved, but upon frame-by-frame inspection, I saw that the image jumps down, turns gree, then blue, then jumps back up to red, then after the bike passes, it's normal.

See the sample here: http://www.quidditypark.com/COLORSPLIT.mpg ... it's about 9 megs.

So can anyone tell me the physics/mechanics of this issue?

Thanks,

DJ

Justin Tomchuk · July 4th, 2006, 02:59 PM

I am having trouble playing your video for some reason. Is there any specific codec I should download?

Graham Bernard · July 4th, 2006, 03:24 PM

Fascinating!

If you repeat the process but shoot through chain link fencing, and focus on an object on the other side of the chain link fencing, the light from the object passes by the out of focus chain links but it is ever so slightly softer. I can imagine that if I was to "dolly" the camera across the front of this chain link fencing I would see a "wave" of sharp>soft>sharp>soft focus - leaving the impression of the object "moving". Here you and the object stay still but the cyclist - my chain link fencing - is moving. The result is this wave of movement. But! Your movement is UP and DOWN! Weird . . . Is it at all possible that the cyclist had some semi-transparent windshield? Is this what we are seeing? An aberration as the object light is diffracted UP and DOWN?

Failing all this, could the sync hing of the 3 CCDs gone? UGH!

Another thought is, is this the resultant effect of the warning that Canon say about NOT have the OIS - steadying mode - switched on while on a tripod?

Truly fascinating!!!

You had ANYTHING like this before?

Grazie

DJ Kinney · July 6th, 2006, 09:06 PM

I'm glad you found this as interesting as I did. I've never had anything like it before, and after looking at it a few more times, it really seems like there is not a refracting lens.

Also, check out the fact that it isn't just up and down, it is in a slightly triangular configuration. Is this not the same as the CCDs? It's two low--the green and blue--and then red is actually higher than the baseline. The colors don't look as vivid as they do on a monitor, but the refraction or color separation is very clearly visible.

DJ

July 4th, 2006, 12:26 PM	#1
DJ Kinney Major Player Join Date: May 2005 Location: Portland, OR Posts: 277	VERY STRANGE - Apparent CCD color splitting So this is odd. I was shooting with a GL2, a passed-out guy across the street. About 75 feet away, with zoom pretty close. A bicycle passed in front of the guy, and the image suddenly jumps in its apparent position. Now, I noticed this because it looked like the camera moved, but upon frame-by-frame inspection, I saw that the image jumps down, turns gree, then blue, then jumps back up to red, then after the bike passes, it's normal. See the sample here: http://www.quidditypark.com/COLORSPLIT.mpg ... it's about 9 megs. So can anyone tell me the physics/mechanics of this issue? Thanks, DJ

July 4th, 2006, 02:59 PM	#2
Justin Tomchuk Regular Crew Join Date: Jun 2006 Location: Montreal Posts: 164	I am having trouble playing your video for some reason. Is there any specific codec I should download?

July 4th, 2006, 03:24 PM	#3
Graham Bernard Old Boot Join Date: Aug 2002 Location: London UK Posts: 3,633	Fascinating! If you repeat the process but shoot through chain link fencing, and focus on an object on the other side of the chain link fencing, the light from the object passes by the out of focus chain links but it is ever so slightly softer. I can imagine that if I was to "dolly" the camera across the front of this chain link fencing I would see a "wave" of sharp>soft>sharp>soft focus - leaving the impression of the object "moving". Here you and the object stay still but the cyclist - my chain link fencing - is moving. The result is this wave of movement. But! Your movement is UP and DOWN! Weird . . . Is it at all possible that the cyclist had some semi-transparent windshield? Is this what we are seeing? An aberration as the object light is diffracted UP and DOWN? Failing all this, could the sync hing of the 3 CCDs gone? UGH! Another thought is, is this the resultant effect of the warning that Canon say about NOT have the OIS - steadying mode - switched on while on a tripod? Truly fascinating!!! You had ANYTHING like this before? Grazie

July 6th, 2006, 09:06 PM	#4
DJ Kinney Major Player Join Date: May 2005 Location: Portland, OR Posts: 277	I'm glad you found this as interesting as I did. I've never had anything like it before, and after looking at it a few more times, it really seems like there is not a refracting lens. Also, check out the fact that it isn't just up and down, it is in a slightly triangular configuration. Is this not the same as the CCDs? It's two low--the green and blue--and then red is actually higher than the baseline. The colors don't look as vivid as they do on a monitor, but the refraction or color separation is very clearly visible. DJ