red edge in photo

[gogopix]

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If you didn't use an IR filter, then for OOF areas any fringing will be exagerated by the extra intensity hitting the 'R" sensor sites. Seems you might check to see if the IR cutfilter reduces this as well.

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[colorflow]

As many others have previously pointed out, astigmatism is a different lens fault.

 

Astigmatism is an optical phenomenon which can happen with camera lenses as well as the micro sensor lenses. I think the latter is what Leica was referring to.

 

Alan

[AlanG]

Astigmatism is an optical phenomenon which can happen with camera lenses as well as the micro sensor lenses. I think the latter is what Leica was referring to.

 

Alan

 

Yes astigmatism is an optical fault. As I understand it, astigmatism is the inability to focus on a vertical line while simultaneously focusing on a horizontal line in the same plane. (Due to the lens being out of round - e.g. not rotationally symmetrical.) I am not familiar with astigmatism causing chromatic aberations.

 

I did some research and there are two types of astigmatism. Perhaps the third order astigmatism in some optical systems can cause color shifts but I haven't seen examples demonstrating this.

 

Astigmatism - Wikipedia, the free encyclopedia

 

As Leica was referring to the thin sensor cover flter, I'm not sure what this could have to do with less astigmatism vs. a thicker filter. But I'm certainly not an optical expert.

[colorflow]

Thanks Alan, I am so glad that you know something about this. I really suspect this is a digital camera phenomenon as mentioned by others on this thread. I have not seen this in film with the same lens on an M6 under similar, but not identical, settings. Even Leica was alluding to this by saying because of their thin lenses in front of the sensors they will not have this fringing problem which is often seen on other digital cameras. But seems like they do, at least on my M8.

 

In any case, it seems like a lot of work if one wants to get rid of the fringes entirely with PS.

 

Alan

[AlanG]

I posted a sample of an image that had C/A that was automatically eliminated via raw conversion.

 

http://goldsteinphoto.com/dxo-c1.jpg

 

You can alos see that DxO has the ability to make darker areas in shadow look as if they have been lit.

[colorflow]

These photos look great after correction. I tried using Lightroom and was only able to eliminate about 50% of the fringing. What is DxO? I am new at this.

 

Alan

 

ps: you sure keep a neat kitchen!

[AlanG]

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That isn't my kitchen. I photograph a lot of homes.

 

Not many people know about DxO. To learn about DxO, go to DxOoptics.com I'm a true believer now.

 

DxO Optics is now a full fledged raw converter with a lot of features. It started out more as a lens correction tool and was weak when it came to actual color and image correction. Now it is much better. Their unique vision is to test cameras and lenses for vignetting, C/A, distortion and uneven sharpness. They then program corrections for these defects into lens modules and these defects are automatically minimized by the DxO software when you work on a file. (It uses the Exif data to know what lens, focal length, f stop and distance was used.)

 

Unfortunately Leica raw files are not supported as they haven't yet made modules for Leica cameras and lenses. (I'm not sure if they will.) I just wrote to DxO today and suggested that they set up the program to support more raw formats even if they can't test the individual lenses and cameras. At least you would be able to use their manual controls to adjust the lens corrections and other features. It seems they would be able to sell more copies that way. So let's see if they consider this idea. Hearing this suggestion from others can't hurt. So write to them also if it interests you.