Spherochromatic Aberration Correction with Dfringe

[k-hawinkler]

Advertisement (gone after registration)

Douglas Herr of wildlightphoto.com characterizes spherochromatic aberration as, quote:

"green/magenta color fringes in high-contrast out-of-focus details."

http://www.l-camera-forum.com/leica-forum/leica-r-leica-flex/263715-rate-r-telephoto-lenses-best-downward-3.html#post2248081

 

Both Leitz Telyts 560/5.6 and 560/6.8 share this feature.

Here is an example of the 560/6.8 shot on NEX-7.

 

Without Dfringe Correction.

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

 

With Dfringe Correction.

 

More examples can be found here: http://www.l-camera-forum.com/leica-forum/landscape-travel/294244-truchas-peak-nm-july-2013-a.html

 

If one converts these two images to B&W then the differences are hardly noticeable unless one pixel peeps.

So these lenses are well suited to eventually resulting B&W images.

[Advertisement]

The Leica Q3 is available for pre-order at B&H Photo Video and Adorama

[01af]

You can do the same in Adobe Lightroom or Camera Raw.

[IWC Doppel]

Looks like the bird lost the fight with the strawberry pie :-)

[k-hawinkler]

You can do the same in Adobe Lightroom or Camera Raw.

 

Thanks. That's what I used, Dfringe function of ACR in LR5 or CS6.

[k-hawinkler]

Here is a particularly striking example.

Some of my friends with color-blindness could see the difference here but no in the other examples.

 

The lens aberration problem

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

 

Corrected with the Defringe function in LR5

Shot with D800E + 560/6.8.

 

Of course, better focused and post-processed the lens can generate more acceptable results.

This time shot with NEX-7 + 560/6.8.

[01af]

Corrected with the Defringe function in Lr 5

[...]

Shot with D800E + 560/6.8.

Using Lightroom's Defringe function, you got rid of the green and purple colour fringes ... but at the same time you created some ugly artifacts around the bird's feet and tip of the beak.

 

So when using the Defringe function, you must check the picture for this kind of artifacts and then locally reduce the defringing there. You'll need to check at high magnification, so for a picture with lots of details, this can be some tedious work. It's probably not worthwhile for small web images—but for, say, a large exhibition-grade print you definitely want to go through this chore.