topic Re: R5 and RF 24-70 f2.8 IS USM chromatic aberration in RAW in EOS DSLR & Mirrorless Cameras

R5 and RF 24-70 f2.8 IS USM chromatic aberration in RAW

NSphotographer — Thu, 03 Oct 2024 22:31:01 GMT

I am experiencing significant CA distortion when taking landscape photos into the sun. With Digital Lens Optimizer applied the income correction is only effective in JPEGS. RAW photos are not corrected. Is this the expected outcome?

Canon setup: R5, RF24-70 IS USM, POLARIZER.

ISO 50, 70mm, f6.3, 1/100s RAW, 42.6MB

Thanks

Re: R5 and RF 24-70 f2.8 IS USM chromatic aberration in RAW

shadowsports — Fri, 04 Oct 2024 00:05:23 GMT

Greetings,

Please start by reviewing this KB article. According to this article, CA cannot be corrected on JPGs, only RAW. Are you certain you have the lens profile downloaded for the lens?

Using the Digital Lens Optimizer in Digital Photo Professional Ver.4.x (canon.com)

Re: R5 and RF 24-70 f2.8 IS USM chromatic aberration in RAW

Tronhard — Fri, 04 Oct 2024 02:02:43 GMT

What software are you using to process your RAW images?
There are actually two types of Chromatic Abberation: Lineal and Transverse. In digital sensors, axial CA results in the red and blue planes being defocused (assuming that the green plane is in focus), which is relatively difficult to remedy in post-processing, while transverse CA results in the red, green, and blue planes being at different magnifications.

It is important that your post-processing software had the correct lens correction algorithms. Generally programs like Adobe Photoshop and Lightroom, will have these Transverse corrections available and usually do the corrections as the RAW images are loaded. In-camera lens corrections for Transverse Aberrations are done to JPGs only.

Re: R5 and RF 24-70 f2.8 IS USM chromatic aberration in RAW

Peter — Fri, 04 Oct 2024 08:01:15 GMT

The part seems to be in clipped highlights.

Digital photography introduced some new types of color fringes, that are not lens chromatic aberration. They are frequently confused with TCA and unfortunately they occur often mixed with TCA. These effects might be visible as purple or blue fringes and are visible around overexposed areas in most cases.

https://hugin.sourceforge.io/docs/manual/Chromatic_aberration.html

The part of the boat that is not in the clipped area has TCA that is easy to correct.

Re: R5 and RF 24-70 f2.8 IS USM chromatic aberration in RAW

Zhaopian — Tue, 08 Oct 2024 16:40:54 GMT

Good article. I'm not sure I totally understand what CA and DLO are--but I do have them enabled in my camera.

I downloaded the lens data and played with the sliders. Honestly, I can't tell any difference.

As I see Lightroom Classic has my lens annotated in the Lens Correction panel, I guess it auto loads the lens data.

Thanks.