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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 28 Jul 2010 (Wednesday) 15:00
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Purple fringing with my 135L - need help

 
hawking_0103
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Jul 28, 2010 15:00 |  #1

Been using this lens for a month, I noticed some shots coupled with purple fringing yesterday and it caught my attention ever since.
I need help from you guys, as I'm not sure its because I was using f/2.0 in all shots. Has anyone tried to shoot anything other than portraits at f/2.0??

This is the first picture which caught my attention about purple fringing with my 1 month old lens. As you can see, the sky is overexposed, but I'm not sure this was the reason for the purple fringing. (All images are straight out from camera, converted from RAW to jPeg, set quality 100% in LR3)

IMAGE: http://farm5.static.flickr.com/4153/4838761040_f590ede22e_b.jpg

Image Crop:
IMAGE: http://farm5.static.flickr.com/4088/4838761342_a92a6a9ecf_z.jpg

I couldn't believe I got a lemon (LOL) so I took some test shots today, the purple fringing is obvious when I pixel peep.
IMAGE: http://farm5.static.flickr.com/4147/4838728374_d48d0b7df8_b.jpg

Crop:
IMAGE: http://farm5.static.flickr.com/4150/4838729846_f58e1ce048.jpg

Another one
IMAGE: http://farm5.static.flickr.com/4124/4838103073_ccf09c2219_b.jpg

Crop
IMAGE: http://farm5.static.flickr.com/4107/4838116081_399b9eb9ba_z.jpg

IMAGE: http://farm5.static.flickr.com/4108/4838729232_5c1101bbb9_z.jpg

Just FYI, all images were taken using f/2.0, not sure this is the cause of purple fringing.
I need help if this is a lemon then I have to send this back to Canon Canada.

Thanks!

-Kenzie-
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PNPhotography
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Jul 28, 2010 15:02 |  #2

what did you expect? It's a F2 lens.
Paul


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hawking_0103
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Jul 28, 2010 15:03 |  #3

As I said, I was asking if f/2.0 and overexposure is the main cause of purple fringing. And do people get this kind of fringing at f/2.0 especially with 135L. Thanks I appreciate your answer but it isn't helpful.


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alpha_1976
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Jul 28, 2010 15:04 |  #4

No this is no lemon and completely normal. Stop down and it'll be gone.


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hawking_0103
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Jul 28, 2010 15:04 |  #5

Thanks Madhu for answering. :D


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jdang307
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Jul 28, 2010 15:32 |  #6

That is normal for the 135L. I saw it too in NYC. Making sure you don't blow anything out is good. Also, you have to pixel peep to see it. On my 85/1.8 it was so apparent you could see it during web sized photos.

Stop it down. Or in lightroom drop the magenta or purple slider down a little bit.




  
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fnothaft
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Jul 28, 2010 16:03 |  #7

hawking_0103 wrote in post #10619988 (external link)
I couldn't believe I got a lemon (LOL) so I took some test shots today, the purple fringing is obvious when I pixel peep.

Perhaps your problem is there...

I just got the 135L as well, and yes, there is CA wide open, especially when you shoot a high contrast edge. Your first photo, you have something dark against a completely blown out background, and you're shooting completely wide open. It's not a lens problem, it's a user (exposure) problem.


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hawking_0103
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Jul 28, 2010 16:16 |  #8

fnothaft wrote in post #10620355 (external link)
Perhaps your problem is there...

I just got the 135L as well, and yes, there is CA wide open, especially when you shoot a high contrast edge. Your first photo, you have something dark against a completely blown out background, and you're shooting completely wide open. It's not a lens problem, it's a user (exposure) problem.

Thanks, and yeah I noticed the sky too.. I was shooting some random people using f/2.0 and I forgot to stop it down when shooting the streetcar. When I got home i thought I'm holding a lemon. :D


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versedmb
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Jul 28, 2010 16:17 |  #9

fnothaft wrote in post #10620355 (external link)
... Your first photo, you have something dark against a completely blown out background, and you're shooting completely wide open. It's not a lens problem, it's a user (exposure) problem

.

Ditto.


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theextremist04
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Jul 28, 2010 17:06 |  #10

It's called longitudinal CA (LoCA) and it's really hard to avoid on fast primes...my Sigma 50 1.4 has LoCA like crazy, but like said, once you stop down it's gone.


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mmahoney
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Jul 28, 2010 17:43 |  #11

That's poor IQ .. a well tuned 135 will show ZERO CA or purple fringing of any kind in any lighting, even strong backlighting or high contrast. I posted some CA free samples here some weeks ago taken in severe lighting. I've taken tens of thousands of files with that lens and only see CA on those where I've missed focus .. if focus is on there is zero CA or PF.

Send it in for adjustment, it's worth the trouble.


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fnothaft
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Jul 28, 2010 18:09 |  #12

mmahoney wrote in post #10620851 (external link)
That's poor IQ .. a well tuned 135 will show ZERO CA or purple fringing of any kind in any lighting, even strong backlighting or high contrast. I posted some CA free samples here some weeks ago taken in severe lighting. I've taken tens of thousands of files with that lens and only see CA on those where I've missed focus .. if focus is on there is zero CA or PF.

Just out of curiosity, can you link to the files? In any case, he noticed CA on what seems to only be OOF transitions between extreme light and dark. At least, that was my impression.

hawking_0103 wrote in post #10620427 (external link)
Thanks, and yeah I noticed the sky too.. I was shooting some random people using f/2.0 and I forgot to stop it down when shooting the streetcar. When I got home i thought I'm holding a lemon. :D

It happens! I think the general problem is that it's somewhat difficult to make a super-fast prime that doesn't have CA, especially at hard transitions.


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Digital ­ Means
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Jul 28, 2010 18:12 as a reply to  @ fnothaft's post |  #13

IDK, I only shot my 135 wide open, and I've never had CA anything close to that. I've honestly never noticed any CA at all. My 85 1.8 had noticeble CA wide open.


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hawking_0103
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Jul 28, 2010 18:20 |  #14

Worst case I just send it in since it still has 11 months warranty.


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Lani ­ Kai
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Jul 28, 2010 18:24 |  #15

Mine shows about the same amount of CA at f/2. It's still better than my 85L at f/1.2, which in turn is better than the 85/1.8 I used to have.


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Purple fringing with my 135L - need help
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