Colour fringes on subjects using 85mm 1.2 at f/1.2

lypklypk · 29th March 2009

Hi guys, just wanna check with those who have the 85 1.2, do you guys get fringing (green on mine) on your subjects when you shoot at max aperture?

I brought the lens out for a test shoot just now (newly gotten lens

), and was shooting photos of flowers... when I opened up the photos, I've green fringing appearing on one of the photos (not the rest of the photos, though I didn't exactly shoot a lot). I'm not sure whether it's because I didn't have the lens hood secured on, or whether it's because of the way the light hit the subject... but is there any way to reduce the chances of fringing happening again?

P.S. This being the first L lens i own, I found the resolution so much better than my other lenses... and it's so sharp that I found it over sharpened and it's hurting my eyes

Dream Merchant · 29th March 2009

CA or color fringing with the EF 50mm 1.4, 85 1.2, 85 1.8 and 100 2 is common.

Try to shoot closed down more, shot in RAW and correct during post, or avoid instances that exceberates CA.

lypklypk · 29th March 2009

Originally Posted by Dream Merchant

CA or color fringing with the EF 50mm 1.4, 85 1.2, 85 1.8 and 100 2 is common.

Try to shoot closed down more, shot in RAW and correct during post, or avoid instances that exceberates CA.

I've the 100 f2, but never noticed any fringing. Ok, will take note next time, thanks!

denniskee · 29th March 2009

Originally Posted by lypklypk

I've the 100 f2, but never noticed any fringing. Ok, will take note next time, thanks!

if never notice the ca, it is blessing in disgust cause u r happy with the lens performance, now if u make an effort to look out for the ca, than u may become unhappy with the lens performance at wide open.

lypklypk · 29th March 2009

Originally Posted by denniskee

if never notice the ca, it is blessing in disgust cause u r happy with the lens performance, now if u make an effort to look out for the ca, than u may become unhappy with the lens performance at wide open.

Lol. I use that lens mainly for street photos (b/w mostly anyway), so I guess color fringing isn't the biggest concern

ahbian · 29th March 2009

Wow, that's some major purchase.

It should help if you stop down the aperture.

Dream Merchant · 29th March 2009

Originally Posted by lypklypk

I've the 100 f2, but never noticed any fringing. Ok, will take note next time, thanks!

Oh no! Don't look for it if you don;t notice it! What you don't know won't hurt you!

Headshotzx · 29th March 2009

Doesn't green color fringing have something to do with bokeh? I see bokeh fringing (out of focus edges have the green haloing) often.

lypklypk · 29th March 2009

Originally Posted by ahbian

Wow, that's some major purchase.
It should help if you stop down the aperture.

Actually, stopping down the aperture defeats the main purpose of buying the lens

I've not tried correcting CA in Lightroom before... Guess I've to play around with it more often now

lypklypk · 29th March 2009

Originally Posted by Dream Merchant

Oh no! Don't look for it if you don;t notice it! What you don't know won't hurt you!

You mean the way the penguins did it in Madagascar?

"You didn't see anything...."

lypklypk · 29th March 2009

Originally Posted by Headshotzx

Doesn't green color fringing have something to do with bokeh? I see bokeh fringing (out of focus edges have the green haloing) often.

It's the first time I've seen CA on any of my lenses, so I don't really know what kind of conditions will make them appear more apparent.. Have to do some reading up...

Dream Merchant · 29th March 2009

Originally Posted by lypklypk

You mean the way the penguins did it in Madagascar?

"You didn't see anything...."

SSSSHHHHHHhhhhhhh!!!!! You really didn't!

Wiki Chromatic Abberations, and you will discover a lot.

CAs 'turn up' more often in high-contrast and backlit/side-lit conditions where the subject (any subject) is cast in back or side-light. Think of a window frame shot from the inside of a dimly lit house in bright daylight, or just tree branches against the day sky.

Headshotzx · 29th March 2009

After some tweaking in lightroom2 to reduce the purple CA, I got the above result. You can see that the branch in the background has a cyan colored edge to it. Maybe your lens is exhibiting such CA? If that's the case, it's normal. The above photo was shot on a 70-200 2.8IS.

Cheers,
Zexun

Edit: It is close to a 100% crop-- Bokeh CA is well controlled on the 70-200.

ahbian · 29th March 2009

Originally Posted by lypklypk

Actually, stopping down the aperture defeats the main purpose of buying the lens
I've not tried correcting CA in Lightroom before... Guess I've to play around with it more often now

True true. But if conditions are such that CA will be introduced, and you don't want to do to much PP to the photo, stopping down is the easiest option.

Just because have ferrari doesn't mean must always drive at top speed mah.

Any, have fun shooting around this "apparent weakness" , its a dream of a lens.

Shin Howard · 29th March 2009

I have CA noticeable on my 85L too. It happens when I shoot wide open at bright light shining at usually white colored objects. It seems as if a thin purple aura surrounding the object. But I haven seen anything green before. Try posting your test pic here to share.
Btw mine is not too obvious. So I'm still pretty happy with it.

lightning · 29th March 2009

Originally Posted by lypklypk

Actually, stopping down the aperture defeats the main purpose of buying the lens
I've not tried correcting CA in Lightroom before... Guess I've to play around with it more often now

I disagree with this. A F1.2 Lens allows the camera to AF faster in an extremely low light conditions even when you stop down. Cos the camera uses the aperture at F1.2 during AF. the bokeh of 85f1.2 is different from 85f1.8 also.

CA only occurs when you shoot at bright surface. Never have issues with portraits and even at indoor events.

lypklypk · 30th March 2009

Originally Posted by ahbian

True true. But if conditions are such that CA will be introduced, and you don't want to do to much PP to the photo, stopping down is the easiest option.

Just because have ferrari doesn't mean must always drive at top speed mah.

Any, have fun shooting around this "apparent weakness" , its a dream of a lens.

Haha.... that'll be like owning a ferrari in SG and you can't even get past 100 most of the time...

lypklypk · 30th March 2009

Originally Posted by lightning

I disagree with this. A F1.2 Lens allows the camera to AF faster in an extremely low light conditions even when you stop down. Cos the camera uses the aperture at F1.2 during AF. the bokeh of 85f1.2 is different from 85f1.8 also.

CA only occurs when you shoot at bright surface. Never have issues with portraits and even at indoor events.

That's not true... we all know how slow the AF of the 1.2 lens is compared to say, the 1.8...

Bokeh is definitely different, but the point I noted was about not using the lens at f/1.2, and not comparing it to the 85 1.8

lightning · 30th March 2009

Originally Posted by lypklypk

That's not true... we all know how slow the AF of the 1.2 lens is compared to say, the 1.8...

Bokeh is definitely different, but the point I noted was about not using the lens at f/1.2, and not comparing it to the 85 1.8

Do you have to use the lens at F1.2 cos it is a f1.2 lens? In portrait, I often shoot at F8 even it is a F1.2 lens. Try shooting in an extremely low light condition and test out the AF accuracy of 85F1.2 and 85F1.8 you will know the diff. We are talking about being able to still AF in the dark vs hunting in the dark. The key is EXTREMELY low light condition.

Belle&Sebastain · 31st March 2009

sorry to sound like a broken horn, real owners of the 85LII will not harp on its slowness, i certainly do not think the focusing speed is a problem.

29th March 2009	#1
lypklypk Member Join Date: Oct 2006 Posts: 865	Colour fringes on subjects using 85mm 1.2 at f/1.2 Hi guys, just wanna check with those who have the 85 1.2, do you guys get fringing (green on mine) on your subjects when you shoot at max aperture? I brought the lens out for a test shoot just now (newly gotten lens ), and was shooting photos of flowers... when I opened up the photos, I've green fringing appearing on one of the photos (not the rest of the photos, though I didn't exactly shoot a lot). I'm not sure whether it's because I didn't have the lens hood secured on, or whether it's because of the way the light hit the subject... but is there any way to reduce the chances of fringing happening again? P.S. This being the first L lens i own, I found the resolution so much better than my other lenses... and it's so sharp that I found it over sharpened and it's hurting my eyes __________________ http://flickr.com/photos/lolrence/ http://www.clubsnap.com/forums/showthread.php?t=458886

29th March 2009	#2
Dream Merchant Member Join Date: Jan 2007 Posts: 4,151	Re: Colour fringes on subjects using 85mm 1.2 at f/1.2 CA or color fringing with the EF 50mm 1.4, 85 1.2, 85 1.8 and 100 2 is common. Try to shoot closed down more, shot in RAW and correct during post, or avoid instances that exceberates CA.

29th March 2009	#6
ahbian Member Join Date: May 2006 Posts: 1,637	Re: Colour fringes on subjects using 85mm 1.2 at f/1.2 Wow, that's some major purchase. It should help if you stop down the aperture. __________________ myflickr

29th March 2009	#8
Headshotzx Member Join Date: Dec 2007 Location: Punggol Posts: 3,993	Re: Colour fringes on subjects using 85mm 1.2 at f/1.2 Doesn't green color fringing have something to do with bokeh? I see bokeh fringing (out of focus edges have the green haloing) often. __________________ Our pictures are our footprints. It’s the best way to tell people we were here - JoeMcnally \| Flickr

29th March 2009	#13
Headshotzx Member Join Date: Dec 2007 Location: Punggol Posts: 3,993	Re: Colour fringes on subjects using 85mm 1.2 at f/1.2 After some tweaking in lightroom2 to reduce the purple CA, I got the above result. You can see that the branch in the background has a cyan colored edge to it. Maybe your lens is exhibiting such CA? If that's the case, it's normal. The above photo was shot on a 70-200 2.8IS. Cheers, Zexun Edit: It is close to a 100% crop-- Bokeh CA is well controlled on the 70-200. __________________ Our pictures are our footprints. It’s the best way to tell people we were here - JoeMcnally \| Flickr

29th March 2009	#15
Shin Howard Member Join Date: Feb 2008 Location: West Region Posts: 919	Re: Colour fringes on subjects using 85mm 1.2 at f/1.2 I have CA noticeable on my 85L too. It happens when I shoot wide open at bright light shining at usually white colored objects. It seems as if a thin purple aura surrounding the object. But I haven seen anything green before. Try posting your test pic here to share. Btw mine is not too obvious. So I'm still pretty happy with it. __________________ I'm looking at a different perpective of life.

31st March 2009	#20
Belle&Sebastain Senior Member Join Date: Jun 2002 Location: here Posts: 3,752	Re: Colour fringes on subjects using 85mm 1.2 at f/1.2 sorry to sound like a broken horn, real owners of the 85LII will not harp on its slowness, i certainly do not think the focusing speed is a problem. __________________ web http://www.9frames.com blog http://gilbertchua.blogspot.com/ WPN http://www.wpn.sg/