Orient XI Posted February 25, 2013 Share #1  Posted February 25, 2013 Advertisement (gone after registration) 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. 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! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/199097-chromatic-bokeh/?do=findComment&comment=2252918'>More sharing options...
Advertisement Posted February 25, 2013 Posted February 25, 2013 Hi Orient XI, Take a look here Chromatic bokeh. I'm sure you'll find what you were looking for!
TomB_tx Posted February 25, 2013 Share #2 Â Posted February 25, 2013 Yes. Even Ken Rockwell writes about it in lens tests as normal. I believe he calls it Lateral Chromatic. Link to post Share on other sites More sharing options...
01af Posted February 25, 2013 Share #3  Posted February 25, 2013 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. Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted February 25, 2013 Share #4 Â Posted February 25, 2013 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 Â I have been on an expensive and rewarding quest for lenses without this issue for some years... Link to post Share on other sites More sharing options...
jaapv Posted February 25, 2013 Share #5 Â Posted February 25, 2013 http://www.l-camera-forum.com/leica-forum/digital-post-processing-forum/115965-fringing-technical-problem.html Link to post Share on other sites More sharing options...
pop Posted February 25, 2013 Share #6 Â Posted February 25, 2013 Obviously you haven't bothered trying a forum search before posting your question, have you? Â 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? Link to post Share on other sites More sharing options...
rirakuma Posted February 26, 2013 Share #7  Posted February 26, 2013 Advertisement (gone after registration) 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  Link to post Share on other sites More sharing options...
pop Posted February 26, 2013 Share #8  Posted February 26, 2013 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. Link to post Share on other sites More sharing options...
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