Is it me or?

i83N · 02-22-2010, 05:41 PM

In every my shot i see a CA no mater what lens i use. Maybe it's me or maybe it's k20d sensor, trying not to blame the glass...

Wheatfield · 02-22-2010, 06:01 PM

It's the glass.
However, any decent raw converter has a CA adjustment built in, so there is no reason to tolerate it.

i83N · 02-22-2010, 06:08 PM

Oh ok that's that's a relive. Still the funny thing I see CA not only on my shots but on others too and in TV, movies.

**Lowell Goudge** · 02-22-2010, 06:26 PM

why not post a sample so we can tell you if you are expecting too much

there are two things to look for in terms of CA, one is typically green on one side and violet on the other side of out of focus detail, this is lateral CA the other is green halo for out of focus behind the focal point and violet halo in front of the focal point this is longitudinal CA.

some lenses have one some have the other some have both.

Pentaxor · 02-22-2010, 06:46 PM

is your contrast set too high on your camera setting?

Igilligan · 02-22-2010, 07:00 PM

I curse the first person who explained to me what PF/CA was and how it was all over one of my photographs...

Up until that day I had never had an issue with PF... once it was pointed out, I saw it in just about every shot I had taken with my P&S...

Bastards!!!!

Fixcinater · 02-22-2010, 07:43 PM

You could start looking at the whole image rather than (just one of possibly many) the flaws in the image.

Technical perfection != perfect image.

snostorm · 02-22-2010, 07:47 PM

Originally posted by i83N

In every my shot i see a CA no mater what lens i use. Maybe it's me or maybe it's k20d sensor, trying not to blame the glass...

Hi i83N,

It's no just you -- I see it all the time too, especially on TV live broadcasts, like the news broadcasts. The really strange thing is that I get a yearly retinal exam to see if my diabetes is doing any damage. They have to dilate my pupils, and in that state, I see purple fringing everywhere. . . pretty wierd,

Scott

joele · 02-22-2010, 09:08 PM

I notice PF a lot of TV shows, and many photos, except when I use the Voigtlander 180/4 ;-)

song_hm · 02-22-2010, 10:02 PM

Originally posted by joele

I notice PF a lot of TV shows, and many photos, except when I use the Voigtlander 180/4 ;-)

I notice a lot of white balance issues on TV. And I cringe everytime I see orange filtered sky.

i83N · 02-23-2010, 01:33 AM

Xmm is more blu and magenta CA i see.
I work with RAW only so the cam settings won't effect it.
I'll put samples later.

Groucho · 02-23-2010, 10:48 AM

Originally posted by Wheatfield

It's the glass.
However, any decent raw converter has a CA adjustment built in, so there is no reason to tolerate it.

I've heard this many times but I have close to zero luck in correcting CA with Lightroom. I've played with the sliders and occasionally it helps a little, but rarely. Most of the time, it does nothing. Defringing occasionally helps with controlling PF, but it can't compete with the purple you get out of the 10-17mm fisheye, for example. If there's some magic "fix CA" button that I've been missing, I'd sure love to hear about it!

If it gets really bothersome, I will often use an adjustment brush and drop saturation on the edges, this effectively turns the color from purple to gray, which is a lot less distracting since most examples of PF will happen with an almost white edge next to an almost black edge.

02-22-2010, 05:41 PM	#1
i83N Veteran Member Join Date: Mar 2009 Location: Lithuania Photos: Gallery Posts: 1,203	Is it me or? In every my shot i see a CA no mater what lens i use. Maybe it's me or maybe it's k20d sensor, trying not to blame the glass...

02-22-2010, 07:00 PM	#6
Igilligan Guest	I curse the first I curse the first person who explained to me what PF/CA was and how it was all over one of my photographs... Up until that day I had never had an issue with PF... once it was pointed out, I saw it in just about every shot I had taken with my P&S... Bastards!!!!

02-22-2010, 06:01 PM	#2
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,976	It's the glass. However, any decent raw converter has a CA adjustment built in, so there is no reason to tolerate it.

02-22-2010, 06:08 PM	#3
i83N Veteran Member Join Date: Mar 2009 Location: Lithuania Photos: Gallery Posts: 1,203 Original Poster	Oh ok that's that's a relive. Still the funny thing I see CA not only on my shots but on others too and in TV, movies.

02-22-2010, 06:26 PM	#4
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886	why not post a sample so we can tell you if you are expecting too much there are two things to look for in terms of CA, one is typically green on one side and violet on the other side of out of focus detail, this is lateral CA the other is green halo for out of focus behind the focal point and violet halo in front of the focal point this is longitudinal CA. some lenses have one some have the other some have both.

02-22-2010, 06:46 PM	#5
Pentaxor Veteran Member Join Date: May 2009 Location: Vancouver, B.C. Photos: Gallery Posts: 6,513	is your contrast set too high on your camera setting?

02-22-2010, 07:43 PM	#7
Fixcinater Veteran Member Join Date: Jun 2009 Location: San Diego, CA, USA Posts: 409	You could start looking at the whole image rather than (just one of possibly many) the flaws in the image. Technical perfection != perfect image.

02-22-2010, 07:47 PM	#8
snostorm Veteran Member Join Date: Oct 2006 Location: Chicago suburb, IL, USA Posts: 1,535	Originally posted by i83N In every my shot i see a CA no mater what lens i use. Maybe it's me or maybe it's k20d sensor, trying not to blame the glass... Hi i83N, It's no just you -- I see it all the time too, especially on TV live broadcasts, like the news broadcasts. The really strange thing is that I get a yearly retinal exam to see if my diabetes is doing any damage. They have to dilate my pupils, and in that state, I see purple fringing everywhere. . . pretty wierd, Scott

02-22-2010, 09:08 PM	#9
joele Veteran Member Join Date: Sep 2006 Location: Melbourne, Australia Photos: Gallery Posts: 1,308	I notice PF a lot of TV shows, and many photos, except when I use the Voigtlander 180/4 ;-)

02-22-2010, 10:02 PM	#10
song_hm Veteran Member Join Date: Dec 2006 Location: Pennsylvania, USA Photos: Gallery \| Albums Posts: 797	Originally posted by joele I notice PF a lot of TV shows, and many photos, except when I use the Voigtlander 180/4 ;-) I notice a lot of white balance issues on TV. And I cringe everytime I see orange filtered sky.

02-23-2010, 01:33 AM	#11
i83N Veteran Member Join Date: Mar 2009 Location: Lithuania Photos: Gallery Posts: 1,203 Original Poster	Xmm is more blu and magenta CA i see. I work with RAW only so the cam settings won't effect it. I'll put samples later.

02-23-2010, 10:48 AM	#12
Groucho Veteran Member Join Date: Jun 2007 Location: Rochester, NY Posts: 416	Originally posted by Wheatfield It's the glass. However, any decent raw converter has a CA adjustment built in, so there is no reason to tolerate it. I've heard this many times but I have close to zero luck in correcting CA with Lightroom. I've played with the sliders and occasionally it helps a little, but rarely. Most of the time, it does nothing. Defringing occasionally helps with controlling PF, but it can't compete with the purple you get out of the 10-17mm fisheye, for example. If there's some magic "fix CA" button that I've been missing, I'd sure love to hear about it! If it gets really bothersome, I will often use an adjustment brush and drop saturation on the edges, this effectively turns the color from purple to gray, which is a lot less distracting since most examples of PF will happen with an almost white edge next to an almost black edge.

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