Odd Halo on video at DVinfo.net

Steven Davis · July 17th, 2006, 08:37 PM

Well,

I'm bedoggled, I have this on my video http://droptodesign.com/test/Image0.jpg
in vegas. But it doesn't show up in my preview monitor. If you look at the corners, you'll see a slight drop off in light. I had a slight AE shift set, so I'm not sure if that was it or not. It's hardly noticable when the video is running. I've never run across this effect since I've had my Canon GL2, going on two years now.

I saw it specifically while capturing this tape, in the little Vegas capture screen, the 1incher.

Graham Bernard · July 17th, 2006, 11:31 PM

I see it Steven.

Are you using a wide angle adaptor? Can I see slight deformation of the right hand edge of the door frame behind the happy couple?

Robin Davies-Rollinson · July 18th, 2006, 12:03 AM

Looks like some form of vignetting to me as well.
Either wideangle converter, or the camera is in it's wide mode anyway and also the aperture is wide open...
It's the lighter edges that show it up. Normally, with more detail in the image, it wouldn't seem so obvious.

Robin

Don Palomaki · July 18th, 2006, 04:10 AM

Looks a lot like normal light fall-off at the corners of a wide open wide shot. This can run a stop or more. ALL lenses do this, but it is usually only noticeable in shots with large, flat areas.

Steven Davis · July 18th, 2006, 04:47 AM

This is just the Canon stock lense, which is what concerned me. I've never seen it before, and it's a lot less noticable in areas that have more light. Sooo, hmm, you recon it was some setting, since I wasn't using and adaptor?

Tim Johnson · July 18th, 2006, 06:34 AM

the halo looks like its from oversharpening to me...

as for the vignetting, im unsure - probably from being wide open.

Steven Davis · July 18th, 2006, 06:46 AM

I'm going to do some testing under similar lighting, I'll see if I can recreate it.

July 17th, 2006, 08:37 PM	#1
Steven Davis Inner Circle Join Date: Jun 2004 Location: Richmond, VA Posts: 3,065	Odd Halo on video Well, I'm bedoggled, I have this on my video http://droptodesign.com/test/Image0.jpg in vegas. But it doesn't show up in my preview monitor. If you look at the corners, you'll see a slight drop off in light. I had a slight AE shift set, so I'm not sure if that was it or not. It's hardly noticable when the video is running. I've never run across this effect since I've had my Canon GL2, going on two years now. I saw it specifically while capturing this tape, in the little Vegas capture screen, the 1incher. __________________ What happens if I push the 'Red' button?

July 18th, 2006, 04:10 AM	#4
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,487	Looks a lot like normal light fall-off at the corners of a wide open wide shot. This can run a stop or more. ALL lenses do this, but it is usually only noticeable in shots with large, flat areas. __________________ dpalomaki@dspalomaki.com

July 18th, 2006, 04:47 AM	#5
Steven Davis Inner Circle Join Date: Jun 2004 Location: Richmond, VA Posts: 3,065	This is just the Canon stock lense, which is what concerned me. I've never seen it before, and it's a lot less noticable in areas that have more light. Sooo, hmm, you recon it was some setting, since I wasn't using and adaptor? __________________ What happens if I push the 'Red' button?

July 18th, 2006, 06:34 AM	#6
Tim Johnson Regular Crew Join Date: May 2006 Location: London, England Posts: 101	the halo looks like its from oversharpening to me... as for the vignetting, im unsure - probably from being wide open. __________________ (Wishes to be more informative and helpful than a nuisance)

July 18th, 2006, 06:46 AM	#7
Steven Davis Inner Circle Join Date: Jun 2004 Location: Richmond, VA Posts: 3,065	I'm going to do some testing under similar lighting, I'll see if I can recreate it. __________________ What happens if I push the 'Red' button?

July 17th, 2006, 11:31 PM	#2
Graham Bernard Old Boot Join Date: Aug 2002 Location: London UK Posts: 3,633	I see it Steven. Are you using a wide angle adaptor? Can I see slight deformation of the right hand edge of the door frame behind the happy couple?

July 18th, 2006, 12:03 AM	#3
Robin Davies-Rollinson Trustee Join Date: Dec 2002 Location: Gwaelod-y-garth, Cardiff, CYMRU/WALES Posts: 1,215	Looks like some form of vignetting to me as well. Either wideangle converter, or the camera is in it's wide mode anyway and also the aperture is wide open... It's the lighter edges that show it up. Normally, with more detail in the image, it wouldn't seem so obvious. Robin

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