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Thread started 06 May 2011 (Friday) 14:33
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Purple & green fringing/CA 85 1.8 -- UGH!

 
YankeeMom
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May 06, 2011 14:33 |  #1

Now I know what you all mean . . . I got my 85 1.8 less than a year ago and I've definitely seen this more than once. I don't rememeber ever seeing it with my cheap-o 50 1.8 though! The worst part is that I couldn't even fix this particular image in LR. When I adjusted the red/blue, the green got worse and vice versa. Guess I have to live with it (unless I feel like cloning -- I might but UGH!)

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IMAGE: http://farm4.static.flickr.com/3617/5693630755_caba7b2e25_z.jpg
IMAGE LINK: http://www.flickr.com/​photos/yankeemom/56936​30755/  (external link)

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FlyingPhotog
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May 06, 2011 14:42 |  #2

What is that, like a 500% crop? Hardly reads at all in the full image.

Pixel Peeping will make you crazy! ;)


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tricky500
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May 06, 2011 15:17 |  #3

Like Jay said, I wouldn't fret the CA. Do what you can to minimize it and take some more pictures..


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agedbriar
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May 06, 2011 15:22 |  #4

I often pixel peep myself :oops: , but not while checking CA.

Also, closing down aperture a bit quickly reduces CA, even with the 85/1.8.




  
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Tony-S
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May 06, 2011 16:20 |  #5

Yeah, your 85mm really sucks bad. I'll take it off your hands and even give you $50 for shipping. ;)


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YankeeMom
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May 06, 2011 16:48 |  #6

I saw it at 100%, when I was cloning out some dirt. OK, I guess it's only a real problem if it showed up in print, but it looks really bad close up and, again, I don't see that with my 50 1.8. I guess I'll hold on to it a bit longer, Tony. ;)


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May 06, 2011 16:51 |  #7

YankeeMom wrote in post #12361121 (external link)
I saw it at 100%, when I was cloning out some dirt. OK, I guess it's only a real problem if it showed up in print, but it looks really bad close up and, again, I don't see that with my 50 1.8. I guess I'll hold on to it a bit longer, Tony. ;)

That is odd cause the 50 1.8 is notorious for fringing and CA


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YankeeMom
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May 06, 2011 20:03 |  #8

Well, I haven't noticed it with my 50 like the 85, but I suppose it could have happened . . . I don't always pixel-peep, but the times I sort of have to are a.) when I am sharpening, b.) when I am cloning, and c.) when I have 2 photos that are seemingly identical and I have to choose one.

So, I see the CA again today -- much worse than even my OP:

Original:

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Crops -- REALLY bad CA, IMO. It was hard not to notice as I adjusted sharpening in LR.

IMAGE: http://farm3.static.flickr.com/2096/5694908020_3e197b9669_z.jpg
IMAGE LINK: http://www.flickr.com/​photos/yankeemom/56949​08020/  (external link)

TEST (external link) by yankeemomnh (external link), on Flickr

IMAGE: http://farm3.static.flickr.com/2078/5694913810_c9e660b0e0_z.jpg
IMAGE LINK: http://www.flickr.com/​photos/yankeemom/56949​13810/  (external link)

Again, it wouldn't bother me as much if I could figure out how to fix it with LR. The levels aren't working in these cases. If anyone has any tips, please share! (I also have Photoshop Elements.) Again, I realize that this sort of CA isn't a huge deal, but in cases like this, I would still prefer to correct it.

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May 06, 2011 22:49 |  #9

LR can't fix this type of CA(Longitudinal) I believe Capture or some other RAW converter can and does a decent job.


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May 06, 2011 23:05 |  #10

This would take like 30 seconds to fix in PS with a saturation layer + mask.. just something to keep in mind if you've got one you want to save.


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sbattey
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May 07, 2011 03:29 |  #11
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It isn't even that bad...

Quit peeping.


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René ­ Damkot
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May 07, 2011 06:16 |  #12

http://toothwalker.org​/optics/chromatic.html (external link)
http://wiki.panotools.​org/Chromatic_aberrati​on (external link)

You can fix transverse (lateral) chromatic aberration in LR quite easily using the CA sliders.
For longitudinal chromatic aberration, you need to locally desaturate the image.

http://www.digital-photography-school.com …c-aberration-in-photoshop (external link)


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May 07, 2011 10:56 |  #13

BrandonSi wrote in post #12362815 (external link)
This would take like 30 seconds to fix in PS with a saturation layer + mask.. just something to keep in mind if you've got one you want to save.

Sigh. I only have Elements.

sbattey wrote in post #12363680 (external link)
It isn't even that bad...

Quit peeping.

Well, it can't get much worse than that! Though, ultimately, it comes down to how it looks in print. I know that -- I wouldn't have noticed it at all if I didn't enlarge to 100% to sharpen.

René Damkot wrote in post #12363904 (external link)
http://toothwalker.org​/optics/chromatic.html (external link)
http://wiki.panotools.​org/Chromatic_aberrati​on (external link)

You can fix transverse (lateral) chromatic aberration in LR quite easily using the CA sliders.
For longitudinal chromatic aberration, you need to locally desaturate the image.

http://www.digital-photography-school.com …c-aberration-in-photoshop (external link)

Oooo, thanks! I'll look into those! I know the CA isn't that big of a deal, but I would still like to know how to fix it if I can. :)


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May 07, 2011 17:02 |  #14

Sigh. I only have Elements.

Which PSE? The latest versions have layers. It doesn't have to be 16 bit for this, just an edge mask and a (saturation) adjustment layer.


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Picture ­ North ­ Carolina
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May 08, 2011 05:37 as a reply to  @ tzalman's post |  #15

If you easily see it at 100%, it's not a figment of your imagination nor is it the result of pixel peeping. It's there.

From the Photzone review (external link):

Bokeh Fringing (Longitudinal Chromatic Aberrations (LoCA))

LoCAs (non-coinciding focal planes of the various colors) are a primarily problem with ultra-fast prime lenses and the EF 85mm f/1.8 USM suffers quite a bit here as well. At f/1.8 the greenish and magenta focus halos are very obvious. The situation improves slowly towards f/2.8 but you can still spot traces of bokeh fringing at f/4 although it's not disturbing anymore here. This is all not unusual but it's not desirable either.


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Purple & green fringing/CA 85 1.8 -- UGH!
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