Chromatic Aberration at DVinfo.net

Nick Wilson · October 21st, 2008, 02:21 AM

Attached is a screen grab of a section on the extreme right of the image from my EX1 (firmware v1.11). The width is about a 1/12 of the frame width. I had not noticed any chromatic aberration before, but this seems significant. Anyone seen similar?

Nick

Steve Phillipps · October 21st, 2008, 02:42 AM

CA seems to be an ever-present problem with HD. You can get rid of it to some extent in post. Also if you underexpose it can help (then pull up the exposure in post). But even fairly pricey lenses seem to show it.
Steve

Paul Curtis · October 21st, 2008, 04:23 AM

Nick,

Seems quite extreme though in this case as the contrast isn't stupidly high between the foreground and background. Is the frame from a zoom move? The chromatic aberation reduction stuff from the lens only kicks in when the zoom has finished.

do you get this all the time?

cheers
paul

Mark David Williams · October 21st, 2008, 04:41 AM

Nick what was the magnification and did you add another lens?

Nick Wilson · October 21st, 2008, 08:45 AM

It was pretty much full zoom, but I was not zooming at the time. The CA is only visible at the right of the frame. I was using 1/500 shutter but cannot see that this would make any difference.

Cheers, Nick

Tom Roper · October 21st, 2008, 01:00 PM

I see CA like that when fully zoomed on distant targets or landscapes, at the edges, at larger apertures.

The lens seems really sharp and good when zoomed in on closeup targets.

Dave Morrison · October 21st, 2008, 01:21 PM

Same amount of CA here, too. Red on one side, green on the other. Seen mostly at full zoom.

October 21st, 2008, 02:21 AM	#1
Nick Wilson Major Player Join Date: Dec 2007 Location: Northampton, UK Posts: 259	Chromatic Aberration Attached is a screen grab of a section on the extreme right of the image from my EX1 (firmware v1.11). The width is about a 1/12 of the frame width. I had not noticed any chromatic aberration before, but this seems significant. Anyone seen similar? Nick Attached Thumbnails

October 21st, 2008, 01:21 PM	#7
Dave Morrison Major Player Join Date: May 2002 Location: West Central Florida Posts: 762	Same amount of CA here, too. Red on one side, green on the other. Seen mostly at full zoom. __________________ EX1, Nikon D750 http://www.morrisonphotographics.com http://www.heritagefilm.com

October 21st, 2008, 02:42 AM	#2
Steve Phillipps Inner Circle Join Date: Apr 2006 Location: Wales Posts: 2,130	CA seems to be an ever-present problem with HD. You can get rid of it to some extent in post. Also if you underexpose it can help (then pull up the exposure in post). But even fairly pricey lenses seem to show it. Steve

October 21st, 2008, 04:23 AM	#3
Paul Curtis Major Player Join Date: Mar 2005 Location: canterbury Posts: 411	Nick, Seems quite extreme though in this case as the contrast isn't stupidly high between the foreground and background. Is the frame from a zoom move? The chromatic aberation reduction stuff from the lens only kicks in when the zoom has finished. do you get this all the time? cheers paul

October 21st, 2008, 04:41 AM	#4
Mark David Williams Major Player Join Date: Dec 2007 Location: Hertfordshire UK Posts: 414	Nick what was the magnification and did you add another lens?

October 21st, 2008, 08:45 AM	#5
Nick Wilson Major Player Join Date: Dec 2007 Location: Northampton, UK Posts: 259	It was pretty much full zoom, but I was not zooming at the time. The CA is only visible at the right of the frame. I was using 1/500 shutter but cannot see that this would make any difference. Cheers, Nick

October 21st, 2008, 01:00 PM	#6
Tom Roper Trustee Join Date: Jun 2004 Location: Denver, Colorado Posts: 1,891	I see CA like that when fully zoomed on distant targets or landscapes, at the edges, at larger apertures. The lens seems really sharp and good when zoomed in on closeup targets.