CA, or color fringing/separation at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


Reply
 
Thread Tools Search this Thread
Old January 26th, 2007, 04:47 AM   #1
Inner Circle
 
Join Date: Aug 2006
Location: Poland
Posts: 4,086
CA, or color fringing/separation

We all saw signs of bad lens performance several weeks ago, with Kaku Ito's first clips; one of them showed a tree on the left scene extremity with bad color separation on its branches. Now, I can see this phenomenon even closer to the picture's center, especially when there is some regular bright area (ie, a rectangular peice of white paper) - the left vertical edge shows some purple, and the right vertical edge - some greennish (or blue, cannot remember now) colors along it. Again: is it just my unit, or is it standard?
Piotr Wozniacki is offline   Reply With Quote
Old January 26th, 2007, 06:25 AM   #2
Major Player
 
Join Date: Dec 2005
Location: Kelkheim, Germany
Posts: 375
I presume it is standard, more or less. My unit shows quite noticable fringing as well.
__________________
Michael
Michael Mann is offline   Reply With Quote
Old January 26th, 2007, 10:57 AM   #3
New Boot
 
Join Date: Dec 2005
Posts: 6
CA is a problem particularly If you are shooting wide angle and with a wide open iris. Stopping down will help and may entirely eliminate the CA.

Stephen Cannon
Stephen Cannon is offline   Reply With Quote
Old January 26th, 2007, 11:35 AM   #4
Major Player
 
Join Date: Mar 2005
Location: Northampton, England
Posts: 500
There does seem to be a bit of variation in the lenses. Some show very little fringing, and some show more.

Generally the fringing in these lenses is quite noticable. It's on a par with the V1 - but for some reason it doesn't hit you quite so much.

Generally the greater the range of the lens, the more CA it shows.
__________________
Alex
Alex Leith is offline   Reply With Quote
Old January 26th, 2007, 11:42 AM   #5
New Boot
 
Join Date: Apr 2006
Location: Provo, Utah
Posts: 14
There are some pretty good software fixes for CA/fringing in digital still photos.

What about video?

Are there any workarounds or plugins etc. for FCP/Vegas/PP so this can be fixed in post?
Jim Hardy is offline   Reply With Quote
Old January 26th, 2007, 11:49 AM   #6
Major Player
 
Join Date: Mar 2005
Location: Northampton, England
Posts: 500
Fixing CA in video is more challenging especially if you're zooming in vision - which of course we all know not to do (but do it anyway).

I haven't tried either of them but:

River Rock Studios make a cheap plugin that can simulate (or fix) CA for Final Cut Pro. http://www.riverrockstudios.com/rive...cheapLens.html

Digital Film Tools also make a slightly more expensive plugin set for FCP that includes CA fixing. http://www.digitalfilmtools.com/55mm...aberration.htm
__________________
Alex
Alex Leith is offline   Reply With Quote
Old January 26th, 2007, 12:45 PM   #7
Inner Circle
 
Join Date: Aug 2006
Location: Poland
Posts: 4,086
Quote:
Originally Posted by Alex Leith
Generally the fringing in these lenses is quite noticable. It's on a par with the V1 - but for some reason it doesn't hit you quite so much.

Generally the greater the range of the lens, the more CA it shows.
So generally, it's less pronounced than with the V1? And how does the A1 compare to the Z1 in this respect?
Piotr Wozniacki is offline   Reply With Quote
Old January 26th, 2007, 05:44 PM   #8
Major Player
 
Join Date: Mar 2005
Location: Northampton, England
Posts: 500
Quote:
Originally Posted by Piotr Wozniacki
So generally, it's less pronounced than with the V1? And how does the A1 compare to the Z1 in this respect?
Actually I meant the other way around. The V1 actually shows worse CA (in my opinion)... but it doesn't seem to jump out at you quite as much (if that makes sense).

When they're there the red/green outlines are really noticable with the A1... but I have to say that they're a relatively rare addition to most images.

The A1 has less colour fringing than the H1, but more than the Z1. Of course the Z1 only has a 12x zoom, so fringing is likely to be less. The HVX200 is the nicest looking lens of this price range of cameras.

You can minimize CA, by avoiding high contrast edges; using the middle of the zoom range; and keeping to medium F stops. Even very expensive lenses show fringing
__________________
Alex
Alex Leith 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 > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:21 PM.


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