Spherical Aberration in LRC in Side By Side Comparisons with Canon Raw to JPG Images

Explorer ,
Aug 17, 2022 Aug 17, 2022

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Hello,

I just shot my new Canon R3 and while reviewing the images in LRC, shot in both raw and jpg, noticed an aberration. I see a convex, spherical aberration in the images.  I seem them regardless of enabling the lens corrections or not. The lens is a Canon EF 24-70 f/2.8, not wide enough to see a fisheye effect.

What would cause this?

I've attached two identical photos, one screen capture of the raw one, and the jpg shot in-camera at the same time. Open them both up and click on one, then the other, and you'll see the distortion.

 

ALSO - why do the thumbnail image number, and the file number below the large image viewer, show different file numbers?? Shouldn't they be the same?? I've attached that image too (Screenshot.)

 

Here's my tech info

Hardware Overview:

  Model Name: iMac Pro

  Model Identifier: iMacPro1,1

  Processor Name: 8-Core Intel Xeon W

  Processor Speed: 3.2 GHz

  Number of Processors: 1

  Total Number of Cores: 8

  L2 Cache (per Core): 1 MB

  L3 Cache: 11 MB

  Hyper-Threading Technology: Enabled

  Memory: 64 GB

  System Firmware Version: 1731.100.130.0.0 (iBridge: 19.16.14243.0.0,0)

LRC:

11.4.1  Camera Raw: 14.4.1

 

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LEGEND ,
Aug 17, 2022 Aug 17, 2022

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In your second image showing the filmstrip, you are conflating an image file name with a LrC index number. That index number is not metadata, it just informs you that 46 is the 46th image in the current filmstrip. Just a considense that it is close to the filename.

 

GoldingD_0-1660786573119.png

 

If it irritates you, it can be turned off:

https://laurashoe.com/2019/08/13/whats-new-in-lightroom-classic-8-4-august-2019-batch-photomerge-pro...

 

 

Note: Do not mark this reply as correct as it only talks to just your add on annoyance, not your actual problem. Marking this reply as correct could cut down on members interest in replying.

 

 

 

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LEGEND ,
Aug 17, 2022 Aug 17, 2022

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As for the convex, spherical aberration , I do not see it, maybe my vision.

 

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Explorer ,
Aug 17, 2022 Aug 17, 2022

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Thanks for the input. Maybe a screen recording will help. Let me know.

Shawn
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LEGEND ,
Aug 17, 2022 Aug 17, 2022

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Video would indeed be better

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Explorer ,
Aug 18, 2022 Aug 18, 2022

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OK, here is a screen capture of me clicking between two photos - a raw and a jpg of the same photo. You should be able to see the aberration happening.

Thank you.

Shawn

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LEGEND ,
Aug 18, 2022 Aug 18, 2022

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I see a vignette issue. So, Ok, a form of spherical aberration, but not a fisheye sort of thing.

Look in your Develop module, any lens correction applied, perhaps increasing the vignette.

 

Also, I  otice that you are using smart preview, wonder if that has some effect. 

 

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Community Expert ,
Aug 17, 2022 Aug 17, 2022

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richardplondon_0-1660802177985.png

This is an overlay in Photoshop with one image set to "Difference" blending mode. Once the two are scaled and positioned as close to the same as possible, flicking between the two versions the differences are negligible IMO and in particular, don't seem to happen in a fisheye type systematic pattern.

 

Perhaps the two versions seemed different, due to slightly different effective crops? Sometimes a JPG / a Raw uses a different boundary for what it shows from the camera sensor. Then when both versions are scaled to the same output dimensions and compared, the picture content will naturally show as if zoomed slightly larger in one, than in the other. Depending which part of the picture we watch, that can seem like a distortion but I don't think the above overlay supports any large difference in the aberration corrections being applied.

 

To me, it's plenty close enough unless your overriding aim is to identically match the camera JPG. If that was your overriding aim then the pragmatic thing would be to just use the camera JPG: chasing after such a goal can often be fruitless.

 

We shoot Raw AFAICT when we want to explore different output and adjustment opportunities, outside of what the camera JPG can give us. "Different" and "identical" are hard to simultaneously deliver!

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