Chromatic aberration at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Sony XDCAM EX Pro Handhelds
Sony PMW-300, PXW-X200, PXW-X180 (back to EX3 & EX1) recording to SxS flash memory.


Reply
 
Thread Tools Search this Thread
Old April 18th, 2008, 08:35 AM   #1
Major Player
 
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
Chromatic aberration

Does anyone know how to get rid of it? Im using an iscorama 54 anamorphic adapter on an EX-1 and noticing a degree of colour fringing sometimes that just doesn't happen on the EX-1s amazing lens. Just wondered if anyone knew of a program to get rid of this?
Mark David Williams is offline   Reply With Quote
Old April 18th, 2008, 09:16 AM   #2
Inner Circle
 
Join Date: Mar 2003
Location: Billericay, England UK
Posts: 4,711
Iscorama 54 huh? So you're shooting 2.66:1 movies. Great! The punch of that is probably worth having some fringing on board.
Tom Hardwick is offline   Reply With Quote
Old April 18th, 2008, 09:49 AM   #3
Major Player
 
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
Agree Tom!
Mark David Williams is offline   Reply With Quote
Old April 18th, 2008, 11:03 AM   #4
Major Player
 
Join Date: Mar 2005
Location: canterbury
Posts: 411
Mark,

It depends on the type of aberration. You might be able to run the footage through after effects and scale the RGB channels differently if it's a simple type of fringing. Other things you can do is to key the fringe colours and desaturate them, sometimes this can work, it really depends on the type of footage.

I'd love to see a frame. What's the resolution like through that adaptor?

cheers
paul
Paul Curtis is offline   Reply With Quote
Old April 18th, 2008, 12:16 PM   #5
Major Player
 
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
Hi Paul

This is without the anamorph

http://www.freewebs.com/markwilliams/without.png

And this is with

http://www.freewebs.com/markwilliams/Anamorph.png
Mark David Williams is offline   Reply With Quote
Old April 18th, 2008, 12:21 PM   #6
Inner Circle
 
Join Date: Mar 2003
Location: Billericay, England UK
Posts: 4,711
Oh dear - I see what you mean. Almost better to mask down the original frame rather than have to accept wooshy edges like that.
Tom Hardwick is offline   Reply With Quote
Old April 18th, 2008, 12:40 PM   #7
Major Player
 
Join Date: Mar 2005
Location: canterbury
Posts: 411
I was about to say something similar. i thought the lens would give you a much wider fov. In this case you'd get better results cropping the original down as Tom says.

Is the adaptor meant for 4:3 cameras perhaps?

Having said that you could squeeze the channels horizontally (try expanding the red a little bit widthwise, 100.25%), i think it would clear it up a bit. Or run it through a photographic (RAW converter) style defringer.

cheers
paul
Paul Curtis is offline   Reply With Quote
Old April 18th, 2008, 12:57 PM   #8
 
Join Date: Nov 2001
Location: santa fe, nm
Posts: 3,264
Images: 10
VirtualDub has a free CA correction filter. Do a search.
Bill Ravens is offline   Reply With Quote
Old April 18th, 2008, 01:01 PM   #9
Major Player
 
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
Quote:
Originally Posted by Bill Ravens View Post
VirtualDub has a free CA correction filter. Do a search.
Bill I was just thinking about you! I was using your picture profile when I took it. This is with Picture profiles off

http://www.freewebs.com/markwilliams...20pp%20off.png
Mark David Williams is offline   Reply With Quote
Old April 18th, 2008, 02:30 PM   #10
Regular Crew
 
Join Date: Feb 2008
Location: Finland
Posts: 25
Err, having looked at the pictures; donīt really know which way to take this. Better without?
Mika Tertsunen is offline   Reply With Quote
Old April 18th, 2008, 02:42 PM   #11
Major Player
 
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
Mika I would say no difference with PP on or off. I just thought people might like to see nd judge for themselvves. Bill I've found the plugin and downloaded virtual dub. Imported the picture and added the filter. However I cant see the effect in the preview screen? When I do get a preview screen its zoomed in so much cant see a lot?
Mark David Williams is offline   Reply With Quote
Old April 18th, 2008, 02:57 PM   #12
Major Player
 
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
I would guess though whatever I do Im not going to get rid of this! Im surprised virtual dub has a tool like this and after effects doesn't.
Mark David Williams is offline   Reply With Quote
Old April 18th, 2008, 03:31 PM   #13
Major Player
 
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
I wonder if I moved the iscorama forward a bit? I'll try that tommorow.
Mark David Williams is offline   Reply With Quote
Old April 18th, 2008, 04:23 PM   #14
Regular Crew
 
Join Date: Feb 2008
Location: Finland
Posts: 25
I guess you could get away with it quite simply by forgetting about the anamorphic adaptor, having framing guidelines in your monitor/viewfinder and cropping afterwards. I donīt know if itīs possible to define a box cursor to the ex, hardly so.
Mika Tertsunen is offline   Reply With Quote
Old April 19th, 2008, 08:08 AM   #15
 
Join Date: Nov 2001
Location: santa fe, nm
Posts: 3,264
Images: 10
The PP settings won't be the cause of CA.(doncha just love acronyms?)
But, my question to you is what aperture settings did you use on the shot with and without CA. CA, in hi quality optics, is made worse by long zooms and apertures too far from the sweet spot. If you were shooting down around f/8 or less, this would be my guess. Also, how does the adapter mount to the cam lens? If it's tilted, even slightly, relative to the lens axis, you could induce CA.
Bill Ravens 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...

Professional Video
(800) 833-4801
Portland, OR

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

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

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 > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 10:32 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network