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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 18:29 |  #16

fnothaft wrote in post #10620955 (external link)
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.

But 135L is still not a super fast lens.. I'm waiting to see some photos shot wide open using this lens.

Guys, if you can, PLEASE post the pictures of thin cables and see how bad the purple fringes are.

If this is a lemon, I need to get this fixins quick by sending it in tomorrow hopefully I can get it back before any important event which is coming up next month. Thanks again.


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fnothaft
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Jul 28, 2010 23:29 |  #17

hawking_0103 wrote in post #10621065 (external link)
But 135L is still not a super fast lens.

:confused::confused:

For a lens of it's length, it is super fast.


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KinoC
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Jul 28, 2010 23:37 |  #18

Kenzie send it back to Canon and you will be very happy. I love my copy!


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kja
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Jul 29, 2010 02:19 |  #19

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.

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

Wow, I'm surprised and never thought to send it in for adjustment. I see the CA on mine, too ;(


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mmahoney
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Jul 29, 2010 04:15 |  #20

fnothaft wrote in post #10620955 (external link)
Just out of curiosity, can you link to the files?

I had this same "it's a fast lens so it will have CA" discussion a few weeks ago on this forum and did post a quick sample of a high contrast file and 100% crops of center and corners straight out-of-camera showing absolutely zero CA or purple fringing. Just search my posts and you should find it.

Worth repeating .. a well tuned 135L shows ZERO CA OR PF under any lighting conditions.


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Rsyx
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Jul 29, 2010 04:41 |  #21

I just made a photo of a tree at f/2, with a metal doorframe in the foreground. The doorframe was OOF and it did show a purple tint in the OOF blur. The leaves in the tree also showed purple fringing.

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Instead of telling everyone to just dig through all your posts, why don't you just post up your sample here mmahoney? :confused:

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mmahoney
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Jul 29, 2010 04:43 |  #22

hawking_0103 wrote in post #10621065 (external link)
Guys, if you can, PLEASE post the pictures of thin cables and see how bad the purple fringes are.

OK .. you owe me for 5 minutes shooting :lol:

These taken just now from my back deck, one of a series of 6 shots of telephone wires photos. Shot wide open at 2.0 with no post-processing of any kind and none has any CA or purple fringing of any kind.

To put this in perspective I shoot full time and the 135 is one of my three most used lenses .. probably sees over 30,000 frames a year. And not a freaking one of those frames shows any CA. Hope I've made my point.

Shots from this morning .. reduced size file and 100% crop.


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Rsyx
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Jul 29, 2010 04:46 |  #23

Thanks mmahoney, this is also helpful to me.

I do see some moderate CA around the branches of the tree, but it's really minimal. Was that shot at f/2?


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mmahoney
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Jul 29, 2010 04:57 |  #24

Rsyx wrote in post #10623486 (external link)
Thanks mmahoney, this is also helpful to me.

I do see some moderate CA around the branches of the tree, but it's really minimal. Was that shot at f/2?

Yes, 2.0 wide open with no post-processing. If you see "moderate' CA around the tree branches you need an eye exam.


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Rsyx
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Jul 29, 2010 05:06 |  #25

mmahoney wrote in post #10623508 (external link)
Yes, 2.0 wide open with no post-processing. If you see "moderate' CA around the tree branches you need an eye exam.

Wow.. Because it's not there or because it's more than moderate?


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lannes
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Jul 29, 2010 05:53 |  #26

mmahoney wrote in post #10623508 (external link)
Yes, 2.0 wide open with no post-processing. If you see "moderate' CA around the tree branches you need an eye exam.

+1 I can't see any, I'm also struggling to get a heap of CA out of my 135mm lens and when I do get some it's been at 200% magnification.

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around 200% magnification, start to see CA.
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Rsyx
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Jul 29, 2010 05:58 |  #27

Look at the 100%, the branches on the left. I do see some CA there, though it's minimal. Maybe it's not me who needs the eye exam. ;)


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fnothaft
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Jul 29, 2010 10:02 as a reply to  @ Rsyx's post |  #28

This is all kind of silly. We're talking about pixel peeping on bizarro test shots. We're taking photos of telephone wires against a blown out sky, shot wide open, and zooming in to 100-200%, or photos with OOF foreground and a lot of detail against a blown out sky, and trying to spot CA. Why doesn't the OP just send the lens in to be calibrated if they really feel that they absolutely need to shoot dark, OOF foregrounds against blown out backgrounds and they can't PP the CA out of the photo? I know that I'll probably send my 135L in shortly, along with my body and my other lenses, just so that focus is as well calibrated as possible on each, but unless you need to send the lens in, it doesn't seem completely practical for a minor issue.


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FJ ­ LOVE
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Jul 29, 2010 11:57 |  #29

hawking_0103 i've never noticed CA on my 135,but i've recently lost infinity focus so i'll be heading to canon on tuesday to have it repaired, at least your lens will have some company.


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Jul 29, 2010 12:06 |  #30

mmahoney, your wires seem better than the OP's since my guess is that the sky isn't as intense of a white. I do see touches of purple on the leaves but that's just being way too anal. Maybe try an extreme case of wires against bright clouds.


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Purple fringing with my 135L - need help
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