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May 20, 2012, 01:12:53 AM


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Author Topic: 24-105mm f/4L Chromatic Aberration  (Read 319 times)

Offline ereuter

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24-105mm f/4L Chromatic Aberration
« on: February 11, 2012, 03:57:46 PM »
I've been playing with my new (used) lens for a couple of days, and it's great. Sharp, great color and contrast. However, there is more CA than I expected from a lens of this price. I haven't used it enough to tell if it's at particular focal lengths or f stops. 

Unfortunately, I'm home and my photos are at the office, so I can't post examples. I will tomorrow.

Just wondering if others have the same impression, or if my copy isn't up to snuff.  I got it used from Adorama, so I could certainly send it back if I needed to.

I've never had a $1k lens before, so I may be asking too much of it.

Thanks-
Eric
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Offline ForFun

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #1 on: February 11, 2012, 05:01:19 PM »
Canon's free DPP works pretty good but I have been using DxO pro 7 trial, lately.  Unbelievable!  When you click on the " before correction" tab and see what the software did, it will amaze you. :)
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Offline 1074

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #2 on: February 11, 2012, 06:40:38 PM »
That doesn't make sense...

@Eric - I don't have the lens, but if you could post example pics that would help!
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Offline Skippy

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #3 on: February 11, 2012, 09:07:58 PM »
I really want to see some examples myself.

I have had almost zero problem with mine and I use it an awful lot.
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Offline ereuter

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #4 on: February 12, 2012, 04:24:25 AM »
Yes, I shouldn't have posted until I had some examples handy.  I had one exposure that was particularly bad, but I apparently deleted it.  Here's what I'm typically getting.  This was shot at ISO 100, 24 mm, f/16, 1/100.

I've attached the whole image, plus two 100% crop details.  CA is visible around the while buildings and boats in the first detail, and along the beams in the second.  Am I being too fussy, or is this normal?  Since this lens is made for a full-frame sensor, it seems like these details are pretty far from the edge of the len's field of view.
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Offline Ctwo

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #5 on: February 12, 2012, 04:50:09 AM »
I'd say  the CA around the boats and house is not what I'd expect...(is that house leaning?)
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Offline Craig

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #6 on: February 12, 2012, 07:33:59 AM »
Quote from: ereuter on February 12, 2012, 04:24:25 AM


I've attached the whole image, plus two 100% crop details.  CA is visible around the while buildings and boats in the first detail, and along the beams in the second.  Am I being too fussy, or is this normal?  Since this lens is made for a full-frame sensor, it seems like these details are pretty far from the edge of the len's field of view.


Could you post the cropped photos again but this time marking where the CA is occurring. This is more to show us that don't understand what CA is.
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Offline ereuter

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #7 on: February 12, 2012, 07:46:28 AM »
I don't have any photo editing software on this machine, but the CA is most evident in the first crop (of the buildings and boats).  It's the misalignment of the colors that you see around the vertical white objects.  A sort of red outline.  Look at the bow of the boat to the left, for example.

It's less apparent in the other crop, but if you look at the beam that is horizontal through the center of the image, you'll see red along the top and light blue along the bottom.
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Offline ereuter

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #8 on: February 12, 2012, 08:06:06 PM »
Quote from: Ctwo on February 12, 2012, 04:50:09 AM
I'd say  the CA around the boats and house is not what I'd expect...(is that house leaning?)

Thanks, Ctwo.  Do you have one of these?  I'm hoping that people who have this lens will chime in.

The CA is easy to fix in Aperture (and probably DPP, but I've never even installed that), but if the lens is faulty, I want to send it back before too long.

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Offline ForFun

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #9 on: February 12, 2012, 08:54:15 PM »
Download the free trial of DxO Pro 7 and try it. The first thing it does when it opens your image, is it downloads the lens correction for that particular lens and installs it (it knows this from the EXIF data).  It then, like magic, corrects it.  These guys have examined and made lens corrections for literally thousands of lens over multiple manufacturers. 
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Offline AndyCivil

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #10 on: February 12, 2012, 10:16:37 PM »
I've borrowed a $1k lens from a friend, and I noticed when taking tree branches at high exposure, there was quite a bit of 'purple fringing' visible. I'll take the lens out tomorrow, and see if I can replicate your result; I can't zoom out to 24mm though, because it starts at 80mm. I'll post what happens.
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Offline ereuter

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #11 on: February 13, 2012, 05:02:22 AM »
Quote from: ForFun on February 12, 2012, 08:54:15 PM
Download the free trial of DxO Pro 7 and try it. The first thing it does when it opens your image, is it downloads the lens correction for that particular lens and installs it (it knows this from the EXIF data).  It then, like magic, corrects it.  These guys have examined and made lens corrections for literally thousands of lens over multiple manufacturers.

ForFun - I understand that it can be corrected in software.  But that's a pain.  I import my photos directly into Aperture, and edit them non-destructively.  If I have to run them through a plug-in first, I end up with twice as much data on my drive.  Aperture can correct the CA non-destructively, but my questions is whether THIS lens should be creating this much CA. 
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Offline Craig

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #12 on: February 13, 2012, 12:52:08 PM »
Ereuter, could you suggest a simple photo I could take to try to replicate your problem. Landscape, trees, buildings?
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Offline Ctwo

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #13 on: February 13, 2012, 02:40:29 PM »
You'll see it a lot on white objects with a darker background - like the moon on a clear night. I've also seen it of tree branches against a light cloudy sky...

I don't have this lens, so my comment is just my personal expectation given the cost of the lens, but I have no basis otherwise other than just looking at reviews and samples of "lower" quality lenses...

Here are some samples with that lens:

http://www.luminous-landscape.com/reviews/lenses/24-vs-24.shtml

http://www.flickr.com/photos/richardspics/3144642026/#lightbox/

Other lens:
http://www.dpreview.com/reviews/canoneos1dsmkii/page20.asp

http://www.the-digital-picture.com/Reviews/Canon-EF-S-55-250mm-f-4-5.6-IS-Lens-Review.aspx

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Offline Ctwo

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Re: 24-105mm f/4L Chromatic Aberration
« Reply #14 on: February 13, 2012, 02:43:35 PM »
Sorry, just realized I had the wrong lens - that was the 24-70...

Here is one review with some samples:

http://photo.net/equipment/canon/24-105/
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