Chromatic bokeh

[Orient XI]

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Has anybody encountered this effect? The bokeh behind the great crested grebes (Podiceps cristatus) is magenta whilst the foreground bokeh is tinted green. This is not an artifact of the location since the foreground faces open country and the background is shaded by green willow trees.

Taken with a 400mm f/5 Telyt (type II) at f/5.6 using an M8.

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[TomB_tx]

Yes. Even Ken Rockwell writes about it in lens tests as normal. I believe he calls it Lateral Chromatic.

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Has anybody encountered this effect?

Obviously you haven't bothered trying a forum search before posting your question, have you?

 

 

The bokeh behind the great crested grebes (Podiceps cristatus) is magenta whilst the foreground bokeh is tinted green.

As a matter of fact, it's just the other way around.

 

It has become fashionable lately to call this phenomenon 'spherochromatism'—a form of chromatic aberration that varies with the spheric aberrations. I'm no expert so I cannot say for sure ... but I think it actually is longitudinal chromatic aberration. If the effect was related to spheric aberration then it would be virtually absent at the frame's center and become worse near the frame's edges. Instead, it is related to the distance from the plane of focus and totally independent from the image height.

 

It's a very common phenomenon, even with modern apo or aspherical lenses. Modern raw converters, like e. g. Lightroom, offer tools to remove or at least mitigate this unwanted effect.

[Erik Gunst Lund]

Most obvious would be to stop the lens down a stop or two, this will reduce/remove the issue, naturally only for images that allow for greater dof and has sufficient light, but in the case above this would have been the best option, also for the scene... IMHO

 

I have been on an expensive and rewarding quest for lenses without this issue for some years...

[jaapv]

http://www.l-camera-forum.com/leica-forum/digital-post-processing-forum/115965-fringing-technical-problem.html

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Obviously you haven't bothered trying a forum search before posting your question, have you?

 

He would have been able to do so if you'd told him that it was called "fringing". Did you mean to keep that a secret?

[rirakuma]

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Most obvious would be to stop the lens down a stop or two, this will reduce/remove the issue, naturally only for images that allow for greater dof and has sufficient light, but in the case above this would have been the best option, also for the scene... IMHO

 

I have been on an expensive and rewarding quest for lenses without this issue for some years...

 

The Voigtlander 180mm Lanthar handles these aberrations and other types of fringing very well. Its very small considering its focal length and with the new M and live view it will be a joy to use. I've attached a sample pic below to show its behavior in similar scenes, I've only done basic WB correction and slight add in contrast. No PP has been done to remove aberrations.

 

Sorry I don't know how to embed the pic onto the reply, I've tried using the image button but it ends up pasting it as a link

 

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Sorry I don't know how to embed the pic onto the reply

 

This thread may be helpful: http://www.l-camera-forum.com/leica-forum/about-leica-forum/144293-how-upload-photos-forum.html

 

Also, please refer to the forum rules concerning the size of the pictures.